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Questions tagged [qt]

Qt is an application framework originally created by Trolltech and currently managed by Digia. The KDE desktop uses the Qt framework for its applications.

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QT Applications Not Adhering to GTK Theme After Upgrading to Ubuntu 23.10

Hello Ubuntu community, I recently upgraded my system from Ubuntu 22.04 to 23.10 and encountered an issue with QT applications. Despite installing Kvantum and attempting to change the theme, these ...
Ali's user avatar
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Why camera not showing on Qt app using libvlc on virtualbox

My camera is not showing up on the Qt app by using the libvlc on the Virtualbox. I'm getting the below error when I debug that the camera can't show on the Qt app. [00007fe3b8098480] main video output ...
L4zyM0nday's user avatar
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31 views

Okular - apt and snap cannot resize

I have been a long-time user of Okular, but after a recent fresh installation, I've noticed the absence of the maximize button. My main issue is the inability to resize the windows, as I can only ...
Marrluxia's user avatar
1 vote
0 answers
46 views

QT apps do not respect file-chooser bookmarks

background In ubuntu files app (Nautilus), a user can create bookmarks to folders in the left pane: most apps respect these bookmarks; I assume this is just by virtue of them using a ~ system file-...
some bits flipped's user avatar
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316 views

Cannot launch Plasma in Wayland

I am completely unable to launch plasma in wayland, and I am completely lost at this point. Steps I have tried: Specify QT_QPA_PLUGIN="xcb;wayland-org.kde.kwin.qpa" in /etc/environment ...
VoxelPrismatic's user avatar
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197 views

Newly deployed Ubuntu 22.04.3 LTS, experiencing a non-showstopper nuisance error Qt: Session management error: networkIdsList argument is NULL?

I built a new server instance on Kamatera cloud. The release was stripped to the core, yet the install was superbly clean. Installed Firefox $ sudo apt install firefox Attempted to install NoMachine ...
Dennis Jorgenson's user avatar
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48 views

How can I let the file date be formatted according to ISO 8601 also in load/store dialogues

I am using Xubuntu 22.04. I have added a line alias date='date -Iseconds' to /etc/bash.bashrc in order to let file dates be formatted according to ISO 8601 (YYYY-MM-DDThh:mm:ss) Further I have ...
Adalbert Hanßen's user avatar
1 vote
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37 views

RaySession theming goes crazy if I press the canvas

I'm facing a problem I have no idea how could I tackle. My main concern is with RaySession, which opens fine, but if I press the wrong place (the canvas), the theming goes crazy, and I'm not able to ...
Akuilera's user avatar
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80 views

qt 6.6.0 help document went wrong

Ubuntu 22.04 At first, I can use qt help documents in qt creator, that means I can search a class name in help mode and I can press F1 in edit mode to get help. But after I upgrade qt to 6.6.0 version,...
那温度's user avatar
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1 answer
2k views

Spyder fails to start: Could not find the Qt platform plugin "xcb" in ""

Error description I have an existing Conda environment with Python 3.8.16, and I have tried to install Spyder with: conda install spyder as well as with conda install -c conda-forge spyder, (not ...
Christopher.L's user avatar
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Receiving "appliction not responding" error

THANKS HAL I started receiving this error after upgrading Ubuntu: I receive this periodically after some functions are activated. I honestly do not recall exactly when this started, but I am ...
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292 views

How to get debug symbols for QT5 in Ubuntu 20.04?

I have the following stack trace from QT. I want to get more detail, but apparently I need some kind of debug symbols for QT5 to see more. However, I have not been able to figure out how. There is ...
Tyler Shellberg's user avatar
3 votes
1 answer
714 views

Spectacle no longer launches

I've tried uninstalling & reinstalling Spectacle, rebooting, but no dice -- it doesn't launch from the Plasma (3.24.7) launcher, nor the command line. Some potentially useful info here though: ➜ ~...
drone1's user avatar
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How to reset Qt package on 22.04?

(Not an advanced Linux user) My GUI apps requiring the Qt library (Konsole, Wireshark, P4V etc) suddenly started seg faulting on start-up. I tried sudo apt reinstall '~i' I tried sudo apt-get install -...
intrigued_66's user avatar
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733 views

unable to launch virtualbox using SSH (Qt FATAL: This application failed to start because no Qt platform plugin could be initialized)

I have a Home Assistant virtual machine in Virtual Box. I typically access it using GUI, but now i'm using the device in a headless setup, so i'm trying to open it using ssh access. The issue I ...
Mohammad Taha's user avatar
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81 views

Polychromatic Error: Wrong Qt Library Version (Ubuntu 22.04)

I got a new Razer mouse, and I'm trying to use Polychromatic to alter colors/DPI. I installed openrazer and Polychromatic as specified on their websites for Ubuntu 22.04, but when I run polychromatic-...
cameronpoe's user avatar
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1 answer
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Is there a current version of PCManFM-Qt that's ready to go?

I'm currently running 0.17.0, but on GitHub the latest version is 1.3 - so I'm wayyy behind. However, when I try apt, it tells me I have the latest version. Snap doesn't have it, neither does Flatpak. ...
Bill in Kansas City's user avatar
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364 views

error ; qt.qpa.xcb: could not connect to display while running gnuplot

I have tried many solutions but I am not able to start gnuplot or any program that needs display using qt. I am using ubuntu extension in windows WSL.
Yash Bajpai's user avatar
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1 answer
154 views

QT6 strange widget rendering when 'XDG_CURRENT_DESKTOP' is defined

~~(Note: This question was originally asked on QT's forum, without much help)~~ We recently upgraded to Ubutnu 22.04, with QT 6.5.1 installed using the online installer. When porting some of our older ...
JosefLintz's user avatar
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How I can increase the qt version in Ubuntu 22.04?

I need to update the latest qt version supported by the Ubuntu 22.04, the default version is 5.15.3. Please help me out to increase the qt version. Thanks in advance.
Suresh Raina's user avatar
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2 answers
4k views

cmake: error while loading shared libraries: libidn.so.11: cannot open shared object file: No such file or directory

I'm trying to build the qt-gstreamer-1.2.0 package listed here. But when I run cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/installation/ according to the README file I encounter the cmake: error while ...
Tungdil's user avatar
1 vote
1 answer
23 views

Why is "sip" missing when I run bzr?

When I run a bzr command such as: bzr config launchpad_username I get a strange error message: Unable to load plugin 'qbrz' from '/usr/lib/python3/dist-packages/breezy/plugins/qbrz': No module named '...
lofidevops's user avatar
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1 answer
417 views

Rescale a QT app to fit a smaller screen

I have to use a QT app developed by a third party. Unfortunately, it does not fit the screen(s) of the computer that I use (with Ubuntu 22). I cannot access all the features of this app simply because ...
C. Crt's user avatar
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How do I install Qt6 QtWebEngineProcess in Ubuntu 22.04?

I installed the following packages: qt6-base-dev, qt6-webengine-dev and libqt6webenginecore6. But my application still returns an error: "Could not find QtWebEngineProcess". I can only find /...
Valentas's user avatar
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ns3 please I have a qst about the instalation of ns3 I had this erreur , and I dont know how I can

youx@youx:~$ sudo apt install build-essential autoconf automake libxmu-dev python-pygraphviz cvs mercurial bzr git cmake p7zip-full python-matplotlib python-tk python-dev python-kiwi python-gnome2 ...
younes amadiaz's user avatar
6 votes
1 answer
11k views

Ubuntu 22.04 with Qt6 - qmake: could not find a Qt installation of ''

In Ubuntu 22.04 after installing Qt6 using sudo apt install qt6-base-dev calling qmake results in an error message: qmake: could not find a Qt installation of '' or qmake: could not exec '/usr/lib/...
d99kris's user avatar
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When opening Git Giu on Ubuntu 22.04 Virtual Box the screen does not show the graphics correctly

When opening Git Giu on Ubuntu 22.04 Virtual Box the screen does not show the graphics correctly. I have recently used the same functionality a couple days ago and I had no problem with it. I really ...
Ruben Perales Gómez's user avatar
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Is it possible to cross-compile among different Ubuntu relases?

Real case scenario: I have a dev machine that runs Ubuntu 22.04. Most of my customers have a dedicated remote machine that run Ubuntu as well, but with different releases - 20.04, 21.04, etc... I ...
Mark's user avatar
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0 answers
60 views

Hard reboot corrupted/removed my Qt library. Couldn't run GUI apps

A little over a week ago I had an issue. My monitor didn't detect my system (Ubuntu 22.04), so I did a hard restart. Unfortunately this caused a problem: Konsole terminal closes immediately because it ...
intrigued_66's user avatar
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1 answer
544 views

Which packages install Qt5 pkg-config files?

I need Qt5 .pc pkg-config file in order to compile this application. Of course I can install the whole Qt5 dev environment using the official Qt online installer. But I wonder if I can install some ...
Mark's user avatar
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233 views

Konsole terminal closes immediately because it cannot locate system icons

I have Konsole (terminal) version 21.12.3 installed on Ubuntu 22.04 from the Software Centre. My monitor didn't detect the signal, so I had to do a forced restart. After restarting, Konsole had much ...
intrigued_66's user avatar
1 vote
1 answer
254 views

Mouse cursor not changing on hover in Qt Apps (22.04)

Usually, the mouse cursor adapts to whatever it's hovering over. However, for maybe one or two weeks now (probably since some update), this will sometimes spontaneously stop working in Qt apps until I ...
Kenny's user avatar
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1 answer
192 views

Can't upgrade from ubuntu 20.04 to 22.04

Im trying to upgrade from Ubuntu 20.04 to 22.04, but the upgrade process stopped at the 'Installing the upgrades' step.
jloria's user avatar
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1 answer
933 views

Cannot mix incompatible Qt library (5.15.3) with this library (5.15.2) - Ubuntu 22.04

Trying to run Nsight Compute 2022.4.0.15 gui using ncu-ui but get this error. $ ncu-ui Cannot mix incompatible Qt library (5.15.3) with this library (5.15.2) I think these were the libraries that ...
Matin Zivdar's user avatar
0 votes
1 answer
260 views

Tiled map editor not launching

I installed Tiled map editor as a snap application from the software store but when I click on it in the app grid, it does not launch. When I tried launching via the terminal I get this error: $ ...
Ayush Saha's user avatar
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0 answers
570 views

Installing an older version of QT

I am using Ubuntu 20.04 x64 desktop. I installed qt using the command sudo apt-get install qt5-default. All went well except I need QT 5.9.5. I see under the build and run tab the following QT 5.12.8 ...
BBB's user avatar
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1 vote
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Since ubuntu 22.04, anaconda-navigator launching errors : warning linux-scaling, Ignoring XDG_SESSION_TYPE, libGL error

Here is my problem : I use jupyterlab across anaconda navigator. Everything was fine on Ubuntu 18 LTS. Since I updated Ubuntu 18 LTS to 22.04 LTS when I run anaconda-navigator in a terminal the ...
an ch's user avatar
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1 vote
0 answers
716 views

Too many kde-frameworks-5-qt-x-y-z-core20 folders in /snap directory

On my Ubuntu machine, I have KDE and Gnome, right now I only use the latter. My /snap directory contains a number of packages with names like kde-frameworks-5-qt-x-y-z-core20, each over 1 GB. There is ...
ahron's user avatar
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1 answer
405 views

Problem with QNetwork request - Error creating SSL context

I have an application which has a feature to display an overlay on a Google Maps display. In order to display a map overlay, my application has a dialog which downloads an xml file describing the map. ...
Allen Kempe's user avatar
1 vote
1 answer
7k views

qmake- No Such File or Directory after Installing QT5

OS: Ubuntu 22.04.1 KDE Plasma: 5.24.6 KDE Frameworks: 5.92.0 QT: 5.15.3 I installed QT5 from their website. Downloaded the installer and ran it. It installed QT in my Home directory and the qmake ...
Artillery's user avatar
  • 356
2 votes
1 answer
17k views

Install qt6 on 22.04

I am trying to install qt6 on Ubuntu 22.04. I have found this answer -> How to install Qt6 on Ubuntu 21.10 where it states that package qt6-base-dev is available on 22.04. However, I get Unable to ...
Rad's user avatar
  • 25
0 votes
0 answers
573 views

Cool Retro Term not displaying

I'm trying to start up cool retro term, and am running into an issue. When I run it using "cool-retro-term" in the terminal, the new window pops up, but it's see-through, as in you can see ...
ZapRowsdower's user avatar
2 votes
1 answer
10k views

WSL2 on Windows 11 (Ubuntu 20.04): cannot run Qt apps, "could not connect to display: :0", xcb module found but not loaded

Qt apps work from Terminal-hosted WSL, but not from window WSL. I am trying to run a Qt app, such as xeyes, on WSL2 with Ubuntu 20.04, on Windows 11. When I launch it (xeyes, or Wireshark, or Qt-made ...
rss.clement's user avatar
0 votes
0 answers
550 views

WSL2 seems to change network configuration or DISPLAY variable on start-up. Where can I see what happens?

I'm using WSL2 with Ubuntu 20.04, and I have a problem trying to run Qt apps, currently discussed in this question. The gist of it is that Qt calls a plugin, xcb, that tries to connect to a display. ...
rss.clement's user avatar
0 votes
1 answer
625 views

Qt creator text editor malfunction under Ubuntu 22.04

I've upgraded my Ubuntu from 20.04 to 22.04 today (clean install) and went through the motions of setting up my development environment. (apt install build-essential libxcb-xinerama0, setting up for ...
Refugnic Eternium's user avatar
0 votes
0 answers
196 views

PCManFM-QT, Dolphin, FTP, and upload/overwrite prompts

In the previous version of ubuntu, PCManFM-QT would not prompt to upload/overwrite remote files when editing in VSCode using PCManFM-QT as my FTP client. I've updated to Ubuntu Studio 22.04 LTS, and ...
Bill in Kansas City's user avatar
0 votes
1 answer
669 views

Fix font size for high-resolution screen

I have a high-resolution monitor. The font and cursor are too small for various applications. As you can see in the screenshot the font for PGAdmin is much smaller than VS code and Chrome. I thought ...
Rayhan Muktader's user avatar
0 votes
1 answer
2k views

How do you resolve: PySide2/designer: symbol lookup error: ... : undefined symbol: _ZdlPvm, version Qt_5?

On Ubuntu 22.04, using Python 3.10.4, I've setup PyCharm community edition 2022.01 to use PySide2 designer (Qt) as an external tool. When I press the "create" button this error is produced ...
Sildeag's user avatar
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0 answers
346 views

Installing the fcitx5-frontend-qt5 package

I am trying to install the fcitx5-frontend-qt5 package so that I can use it on qt applications. Unfortunately, this error comes up every time: Reading package lists... Done Building dependency tree ...
invalidsyntax_'s user avatar
0 votes
0 answers
51 views

apt-get cannot install qt5-default in Ubuntu virtual box installation [duplicate]

I'm using Ubuntu 22.04 LTS running through a Virtual Box on a Windows 10 machine. For my project, I need to install qt5-default, so I run the following command: sudo apt-get install qt5-default ...
user32882's user avatar
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