Skip to main content

Questions tagged [qt5]

Qt 5 is the 5th major version of the popular GUI toolkit for implementing graphical applications. This version contains major changes, and Qt Quick is central to it.

Filter by
Sorted by
Tagged with
0 votes
0 answers
28 views

/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5: version `Qt_5' not found

i am trying to install prismlauncher through the zip file but this shows up. helpp please im using ubuntu 16.04.7 xenial (its outdated because anything above 16.04 doesnt support my laptops legacy ...
Devatrish's user avatar
0 votes
1 answer
80 views

What config file does qt5ct update?

In Ubuntu 24.04, qt5ct crashes if I try to change Style to gtk2. I;ve opened a bug on this. But, meanwhile, does anyone know what config file(s) qt5ct updates when chaning the Style? I just want ...
Mark J. Bobak's user avatar
1 vote
0 answers
52 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
0 votes
1 answer
813 views

symbol lookup error libQt5Qml.so.5

I am new to linux (ubuntu), I don't know what I did, but now I am having some applications not running, example for freecad the error is as follows: freecad: symbol lookup error: /lib/x86_64-linux-gnu/...
Mehdi Coding's user avatar
1 vote
0 answers
89 views

Move min, max, close buttons to the left in Qt windows

Gnome allows to move Min, Max and Close buttons on the left of the title bar. But Qt5 windows don't care (for instance: Clementine, KeepassXC, ...). And there is no option in Qt5 parameters to change ...
Arcesilas's user avatar
  • 135
0 votes
0 answers
348 views

#include <QtWidgets>: no such file or directory

Please don't crucify me. ChatGPT or Google did nothing, so here I am. Basically, I cannot use QtWidgets in my C++ code (for some reason). The problem: When I include the header in C++, I get this ...
Renegade's user avatar
0 votes
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
0 votes
0 answers
263 views

No platform plugin, neither libqtforandroid.so or libqtforandroidGL.so, included in package. Please include one. in ubuntu 22.04

I installed qt 5.15.2 a few hours ago using qt-unified-linux-x64-4.6.0-online.run on ubuntu 22.04. All packages are installed and configured using JDK 17, sdk and ndk 25.1, 22.1, 21.3(automatically ...
Hasibul Hasan Chowdhury's user avatar
0 votes
0 answers
93 views

Installing QT5 with online installer on fresh ubuntu system

After downloading the open source file (qt-unified-linux-x64-4.5.2-online.run) the start ends with "�HD@Xn@8 (invalid encoding)". I'm on a new installed ubuntu (Jetson nano). This is also ...
Peter Kaszian's user avatar
0 votes
1 answer
191 views

Wrong MIME type and icon for a file in Nautilus

I am writing a GUI application in Python using PyQt5, with the main application named main_app.py. Despite being simply a Python script, and file -i main_app.py returning the correct MIME type text/x-...
Arducode's user avatar
0 votes
1 answer
595 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
  • 527
4 votes
1 answer
963 views

How to run a QT5 program compiled for i386 on ubuntu 22.04.1

I have an old program compiled for an ubuntu 16.04 i386, I need to run it or recompile for i386 architecture in my new pc (change 32 to 64 bit is quite complicated in this code". I have an ubuntu ...
Juan Jose's user avatar
2 votes
1 answer
1k views

xmlpatterns: could not find a Qt installation of ''

As part of compiling some external packages like paraview from their sources, I installed the following Qt related packages using aptitude: sudo apt install libqt5x11extras5-dev libqt5help5 qttools5-...
kksagar's user avatar
  • 211
1 vote
0 answers
261 views

qpaeq No module named 'dbus.mainloop.pyqt5'

I'm trying to set up qpaeq under Ubuntu. It returns me this error There was an error importing needed libraries Make sure you have qt5 and dbus-python installed The error that occurred was: No ...
Arthur Attout's user avatar
0 votes
0 answers
807 views

Dark mode not applied to all the applications

I have installed Ubuntu 22.04 and switched to dark mode from appearance settings but it is not working on some applications like virtual box
tbhaxor's user avatar
  • 161
1 vote
0 answers
784 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
  • 232
0 votes
0 answers
580 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
362 views

After installing QT dependencies for KDE Connect now Ubuntu 22.04 won't boot

KDE SMS kept crashing for a week. I went into Discovery and looked at the installed program and saw unmet dependencies: qt??? (2 files were missing & they were version 5.X; don't remember exact ...
myviolinsings's user avatar
2 votes
1 answer
1k views

GTK Style selection not available in qt5ct after re-installation 22.04

As per @Archisman Panigrahi advice, I'm posting a new question regarding qt5ct. I've recently reinstall 22.04 and found that the Style drop-down menu only has Fusion and Windows, hence, I am unable to ...
ManOnTheMoon's user avatar
  • 1,252
3 votes
2 answers
5k views

Can't install qt5-default on Ubuntu 22.04 - required to install IQmol

Installing IQmol is relatively easy (I did it with ubuntu 20.04 without problems). However with Ubuntu 22.04 there is a problem with the qt5-default package that seems to have been updated for this ...
Camilo Febres's user avatar
3 votes
0 answers
2k views

Could not find a package configuration file provided by "Qt5LinguistTools" despite having qttools5-dev qttools5-dev-tools installed

I am trying to compile something, get this error: Could not find a package configuration file provided by "Qt5LinguistTools" with any of the following names: Qt5LinguistToolsConfig....
BaconCatBug's user avatar
0 votes
0 answers
33 views

how to upgrade to Qt 5.5.1 [duplicate]

I already have Qt 5.5.0 on my Ubuntu 18.04.6 LTS (32-bit) and want to upgrade it to Qt 5.5.1 (I don't need to install Qt creator necessarily). Can anyone help me to find a proper way? I'm new in Qt.
Digger's user avatar
  • 1
2 votes
2 answers
10k views

Qt5 install problem ubuntustudio 22.04

The short version of the question: where is qt5 installed on Ubuntu Studio 22.04? The long version of the question can be seen unanswered here on the SuperCollider forums: essentially I am trying to ...
J. Simon van der Walt's user avatar
3 votes
2 answers
8k views

Unable to change QT_QPA_PLATFORMTHEME environment variable

Xubuntu 20.04 LTS I want to change default XFCE theme for Qt applications. It's set to Fusion style on my app. I read from tutorials that I need kvantum manager and qt5ct I installed both packages ...
kamil_debski's user avatar
1 vote
1 answer
523 views

Why does ./configure not find Qt5? Needed for building phonesim from source

Background: I'm trying to build and install ofono-phonesim from source, on Ubuntu 20.04 aarch64, so I can get HFP to work with Pulseaudio 13.99. I'm doing this because of the following: This answer ...
enwave64's user avatar
0 votes
1 answer
531 views

Why is my webcam not recognized by QCameraInfo in Qt5 on Ubuntu 20.04?

I want to list my available webcams using this function included in the QCameraInfo class in Qt 5, but when I check the returned list, I see that it's empty showing there's no webcam working on my ...
Amir Mohsen's user avatar
0 votes
1 answer
2k views

How do I install an ubuntu package from an older release?

I'd like to install libqt5qmlmodels5 from packages.ubuntu.com. The library exists in [universe] for [groovy] [hirsute] [impish]. I'm on Ubuntu 20.04.2 LTS [focal], so apt install doesn't work. Can I ...
Trevor Hickey's user avatar
1 vote
0 answers
730 views

gnuplot Qt5 install FAIL

I'm running 20.04 but after several tries I can not get gunplot to install properly wiht qt5. I followed the instructions from another Q/A: sudo apt install qtbase5-dev qtbase5-dev-tools libqt5svg5-...
Tom Morgan's user avatar
3 votes
2 answers
1k views

Cant open qt based applications

cant open qt based applications such as qbittorrent, nomacs, etc . Getting error: nomacs: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or ...
xenos's user avatar
  • 105
1 vote
0 answers
82 views

QtCore could not be found by catkin_make a SpotMicro(robot-dog)

Anyone met a problem when compiling a spot micro there is an error "reported QT_INSTALL_LIBS as "/usr/lib/aarch64-linux-gnu" but qtcore could not be found there. QT is NOT installed ...
E_Barma's user avatar
  • 11
0 votes
1 answer
129 views

.profile suddenly doesn't like comments [duplicate]

I'm running Xubuntu 20.10 on a MBA 2012. I wanted to use my GTK theme on a QT program, so I did a little searching and ended up with adding export QT_QPA_PLATFORMTHEME=gtk2 to my ~/.profile. That ...
wiggleforlife's user avatar
7 votes
3 answers
2k views

Okular does not respond anymore, needs Qt_5.15

I have Ubuntu 20.04 running on my system and was using the pdf-viewer Okular until recently. However, now Okular does not start when double clicking on a pdf-file and starting from the terminal gives ...
Ubuntu_fan's user avatar
1 vote
1 answer
11k views

How do I download qt5-default for Ubuntu 20.04 LTS?

I need an easy explanation because I am very new to Linux and I want to use an app that makes use of qt5 as requested by their website.
Die Kid's user avatar
  • 11
1 vote
1 answer
171 views

Is it possible to install latest version of RaySession on Ubuntu MATE 20.04 LTS?

I'm testing RaySession application. I have started with its version from official repository. But it seems to be outdated. So I decided to get latest master from GitHub project page https://github.com/...
N0rbert's user avatar
  • 101k
0 votes
0 answers
119 views

qt3dwindow.h missing in focal and xenial

The way dev package for Qt are designed in ubuntu is extremly disturbing to me. Lets take a simple example, QForwardRenderer include file for instance: It is part of bionic: https://packages.ubuntu....
Tobbey's user avatar
  • 101
5 votes
1 answer
3k views

How do I open .qch files?

I've installed the qt5-doc package but I'm not able to open the .qch files that I find in the /usr/share/qt5/doc/ directory. Do you know how I can do this? I've tried using qt5-assistant like this: ...
sunyata's user avatar
  • 275
1 vote
3 answers
5k views

Official .deb WPS Office very slow in opening file - snap version fixes the problem - Why?

I have installed WPS Office ver. 11.1.0.9719 from official website and official .deb x86_64 package. This version of WPS Office is very slow in opening some files. For example, I have this .docx file ...
robertspierre's user avatar
1 vote
0 answers
2k views

Error while running Qt application with wayland

I am trying to run a simple Qt application Hello World on Ubuntu 18.04 desktop with Wayland. Following commands, I tried. $ export QT_QPA_PLATFORM=wayland $ ./qello also tried with following command $ ...
amol_k's user avatar
  • 11
1 vote
1 answer
9k views

Install/upgdate to Qt 5.15 from PPA on 18.04.5 LTS (Bionic)

I'd like to install Qt 5.15 from this PPA (I don't want to use the installer). I've added the PPA but I cannot find an apt get command that installs the all the packages in the right order i.e. sudo ...
Olumide's user avatar
  • 569
0 votes
1 answer
854 views

Viber not starting on Xubuntu 16.04

After installing viber (version 13.3.1) from official debian package viber won't start normally. Viber is installed using dpkg command: $ dpkg -i viber.deb When viber is started, main window is not ...
nexayq's user avatar
  • 143
0 votes
2 answers
4k views

How to update qt version to 5.15.1

i have on kubuntu qt version to 5.12.8, and i need to update it to 5.15.1 i tried to manually install it..the installation folder installs it in /home/Qt. but when i check the qt version is still 5.12....
Andri Nic's user avatar
0 votes
0 answers
3k views

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found

I am trying to plot something on gnuplot using Mobaxterm for windows subsytem for Linux. I installed QT packages and gnuplot etc and was able to successfully plot what i wanted. After i shut down my ...
Bineet's user avatar
  • 1
1 vote
1 answer
892 views

Lyx isn't working (probably related to Qt5)

Lyx won't launch. The only error message it gives me is: lyx: symbol lookup error: lyx: undefined symbol: _ZN17QAbstractItemView11eventFilterEP7QObjectP6QEvent, version Qt_5 Lyx has been taking my ...
lima's user avatar
  • 13
0 votes
0 answers
463 views

Qt error when trying to use GPU rendering for a robotics simulator on headless machine

I'm trying to get a robotics simulator (https://github.com/stepjam/PyRep) working on a remote headless machine with GPU rendering. I've followed the installation instructions, and can run an example ...
user2966082's user avatar
0 votes
1 answer
867 views

i have downloaded qt-everywhere-src-5.15.0 how to install or use it [duplicate]

This downloaded file is in my download folder. Where should I keep this folder and how to use and install it? Previously I deleted all qt5 files show there is an error so I have downloaded it. I have ...
Avishek Acharya Av's user avatar
2 votes
1 answer
602 views

How to install "libqt5webview5-dev" on Ubuntu 16.04 LTS?

I'm not an expert, I'm on Ubuntu 16.04 LTS, and I'm trying to install Stremio by following this tutorial "https://github.com/Stremio/stremio-shell/blob/master/DEBIAN.md" from source codes. ...
Ninoo's user avatar
  • 21
0 votes
0 answers
189 views

How to remove Clementine alternate list background colors? (Qt5)

Like Dolphin, Clementine usually has alternating background colors in lists that look like this in the track view frame: I would like to remove those alternating colors to have a clear view of the ...
Prototype700's user avatar
2 votes
0 answers
1k views

Avogardo requires Qt4 on Ubuntu 20.04

I would be very happy about your help. I have the following problem, I absolutely need avogardo 1.2 for my research. however, I did an ubuntu update without thinking the problems started. ubuntu 20....
ph5's user avatar
  • 21
0 votes
1 answer
2k views

PyQt5 QtMultimedia shows black screen on playing H.264 video

We are using a tool based on PyQt5 for some video processing. Since a few days some users complain, that the tool shows only a black screen instead of a video. Sound is still working. We were able to ...
valpo's user avatar
  • 51
23 votes
3 answers
27k views

qt4 / libqt4-* in Ubuntu 20.04

Ubuntu 20.04 dropped qt4 and all libqt4-* dependencies in its official repos. My knowledge about version conflict and install-breaking actions is limited, so before any unthoughtful action is taken, I ...
Daniel B's user avatar
  • 481

1
2 3 4 5