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.

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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 ...
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1answer
50 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 ...
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FullScreen window is not working properly in Ubuntu 18.04

I have a MainWindow supposed to be always on full screen mode. A Dialog pops up when button "Open Dialog" is clicked. On a desktop system, Ubuntu 20.04, the application works correctly. When ...
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3answers
547 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 ...
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1answer
651 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.
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1answer
30 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 But it seems to be outdated.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/...
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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....
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How to make grouped system tray icons into 1 group | Ubuntu 20.10 GNOME

How to group all system tray icons (qt tray and other tray) in Ubuntu 20.10 panel? (or in Dash to Panel) Somehow I did it in my main computer earlier, but I do not know how... :) This is what I want ...
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1answer
277 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: ...
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3answers
622 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 ...
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0answers
279 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 $ ...
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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 ...
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1answer
159 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 ...
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2answers
990 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....
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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 ...
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78 views

How to build VirtualBox from source?

Hi I am trying to build virtualbox from source on ubuntu 16.04.1 LTS i386 using this link build from here. I installed all the packages but when I run command ./configure --disable-hardening during ...
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104 views

qt5 not found in ubuntu 16.04

hi i am trying to build virtualbox from its source code when i run ./configure it throw me this error * qt5 not found! Check /home/salman/vbox/configure.log for details even i install the qt5-default ...
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1answer
271 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 ...
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356 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 ...
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1answer
347 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 ...
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Trying to build Olive video editor from source and stuck at Qmake

I follow the command instructions but after entering the local Git directory "Olive" , I cannot execute the Qmake successfully. I have installed QT-5 Instructions here: https://...
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1answer
148 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. ...
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64 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 ...
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871 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....
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1answer
532 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 ...
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3answers
14k 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 ...
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1answer
2k views

Qt apps are very slow to load in Xubuntu 20.04 when export QT_QPA_PLATFORMTHEME=gtk2 is enabled

I have installed qt5ct to apply gtk2 theme on Qt apps (by default they follow the Fusion theme). However, Qt apps (I have tried GNU Octave and Brightness Controller) are taking too much time to start ...
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1answer
256 views

Is there a lightweight photo viewer made with Qt?

While the default photo viewer Gwenview is very good, it is also a file manager and has many other features. As a result it is not very lightweight. Is there a very lightweight photo viewer (that ...
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1answer
2k views

Stuck without Qt4 in Ubuntu 20.04

I just upgraded to Ubuntu Focal Fossa and found that the lack of Qt4 means it isnt possible to build antimicro I noticed this post saying it would work with libqt4-dev, and I'm sure would as it ...
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741 views

Qt plugin error at application startup Ubuntu 20.04

Good day. When starting a new application (the installation was successful without any errors) on Ubuntu 20.04, the program starts with an error - ~$ openscada 2020-04-19T00:58:25 1[/] Primary ...
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1answer
286 views

Couldn't find any package whose name or description matched “libqt5ftp5-dev”

I use following command to install packages on UBUNTU1804. sudo aptitude -R -y --allow-untrusted install libqt5ftp5-dev Error: Couldn't find any package whose name or description matched "libqt5ftp5-...
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1answer
2k views

How can I fix “libQt5XcbQpa.so.5: undefined symbol: FT_Get_Font_Format” when I'm already using freetype 2.9?

I finally upgraded from 16.04 to 18.04. Teamviewer was working just fine in 16.04. After the upgrade when I try to launch the GUI it gives me: /opt/teamviewer/tv_bin/TeamViewer: symbol lookup error: /...
2
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1answer
979 views

Error with shared libraries running Salome-Meca

Recently, I installed the latest version of the salome-meca software, obtained from here: https://www.code-aster.org/spip.php?article303 After installed it, I try to run it going into the folder ~/...
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1answer
2k views

What is “'gtk2' Qt style” in Lubuntu 19.10?

OS: Lubuntu 19.10 I have a need for my applications to be entirely dark-themed. Lubuntu 19.10 comes with Adwaita-dark (and Adwaita) for GTK2/3 applications. I've also added the materia-gtk-theme ...
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0answers
168 views

Where is the Ubuntu `*.deb` repository for `qtfm`?

I would like to try the qtfm file browser but [https://www.qftm.org] has vanished. Does anybody know of a .deb repository from which to install qtfm? Can it be installed from source code: $ ./...
2
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1answer
128 views

Dead keys (accents etc) not working since LibreOffice 6.2 (since Ubuntu/Kubuntu 19.04 “disco”)

After updating to LibreOffice 6.2 keyboard input of non English symbols is either ignored or leads to random behavior (for instance the cursor jumps to the end of the line).
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1answer
310 views

How do I discover my current system encoding?

In QtCreator, they have something that looks like this: I changed the defualt encodring setting in an attempt to get my ide to display emojis, and now my system is really acting up. Including web ...
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1answer
529 views

play audio via libqt5multimedia5 without pulseaudio

I have Ubuntu 18.04 installed and would like to use https://gitlab.com/gillesdegottex/dfasma for audio analysis. dfasma links with libQt5Multimedia.so.5 for audio playback. Initially I had the ...
2
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1answer
4k views

Cant find Qt5Designer, qt5svg and qt5x11extras

I'm trying to install KLatexFormula and it's cmake script is giving the error that it cant find the package config files Qt5DesignerConfig.cmake and qt5designer-config.cmake. Cmake asked me to add ...
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0answers
415 views

Trying to run QT 5 Designer on Ubuntu (Budgie) 18.04 with python 3

I have been able to run the QT 5 Designer app from the memnu untill recently. Trying to run from the terminal I get error as below It has to do with the libqscintillaplugin.so plugin. The file is ...
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0answers
47 views

how do I change my default display gui with Qt gui at time of booting on linux

I have already made Qt GUI application, I want to run that application at the time of Linux booting. In simple meaning when I power on my Ubuntu I don't want that default desktop I want my Qt ...
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0answers
26 views

TeamViewer install borked, can't seem to fix [duplicate]

Xubuntu 18.10 So the other day I went to run TeamViewer and found it was gone. So I tried to re-install it and this happens: $ sudo apt install teamviewer Reading package lists... Done Building ...
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1answer
259 views

How to change theme in Qt5 configuration editor when it is too large

I changed theme in Qt5 configuration editor (qt5ct package) and now it is so big that it cannot be resized and the apply button is outside the laptop screen. How to change the theme to gtk2 ? Is ...
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1answer
210 views

Change the Lib request of an executable file

I am currently using a program which called " Write " created by Stylus Labs. It is a single file application which uses the QT5.7 libs. It running on my Laptop with Ubuntu 16.04 x64 Bit. Actually ...
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1answer
26k views

How the heck can I install Qt5 on Ubuntu 16.04 LTS?

I have loads of programs that require Qt4 and I need to install programs that require Qt5. When I try to install Qt5 things start off dodgy and then proceed to insanity. I request friendly guidance. ...
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0answers
79 views

Ubuntu 18.04 - move QT5 application to left or right

Most of the applications I use in Ubuntu 18.04 respond to super+Left Arrow or super+Right Arrow to place the window on the left or right side, as explained in Ubuntu 18.04 - move a window left-right ...
3
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1answer
2k views

QtLocation and QtPositioning not installed

I'm trying to develop a KDE widget that should display a map. At the moment I can't get the widget to load, because of the errors module "QtLocation" is not installed and module "QtPositioning" is not ...
10
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1answer
5k views

Suddenly Okular will not open any more

I have made my laptop double boot a few months again, with Ubuntu 18.04.1 . I have been working with okular to open pdf files (for the commenting option) but suddenly okular doesn't work anymore. When ...
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1answer
5k views

Can't launch Qt Creator in Ubuntu 18.04

My environment initially had qt4 and Qt Creator seemed to work fine back then. I installed qt5 and after that Qt Creator does not launch anymore. Qt Creator works fine in my virtual machine however. ...
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1answer
198 views

Is there qt5-widget-factory just like gtk3-widget-factory?

There is a very useful tool named gtk3-widget-factory in gtk3-devel package. Is there similar tool in Qt5 ?

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