Questions[qt4](ubuntu)

System: Kubuntu-64-bit 20.04 - AMD 64-bit machine
I`m trying to install Quite Universal Circuit Simulator from source code and get error:

configure: error: Qt >= 4.6.0 is required.
configure: error: ./configure failed for qucs

Try to install Qt-4 get error:

apt-get install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui
E: Unable to locate package qt4-dev-tools
E: Package 'libqt4-dev' has no installation candidate
E: Unable to locate package libqt4-core
E: Unable to locate package libqt4-gui

How do I get this work?

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.

1. ubuntu 20.04 installed
2. qt4 was updated to qt5
3. avogardo was automatically updated to avogardo 2.

I downloaded advogardo 1.2. and tried to install. -> following error _ Found unstable Qt version"5.12.8" CMake Error at /usr ...../bin/qmake, this code requires Qt version 4.x Call Stack (most recent call first): CMakelists.txt:226 (fin_package)

Then I found this on askubuntu and tried

sudo add-apt-repository ppa:rock-core/qt4

sudo apt-get update

got still have the same problem as above

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 would want the community's take about this.

Would it be possible to get qt4 to install on Ubuntu 20.04, and if so, which source would not end up breaking the install?

Alternatively, what container method would be the lightest for apps relying on qt4? My usecase for qt4 is solely for some Xilinx ISE components, nothing else, so the lightweight criteria is really important.

I use an application called Mame Set Rebuilder (you can easily find references on internet) that is built in Qt4 in a .app format.

When I had Ubuntu 19.10, I was able to set the fonts of the application using the package qt4-qtconfig. Setting the fonts with this package prevents the app from using some predefined and ugly fonts.

Now I have a fresh Ubuntu 20.04 installation and the package has been removed from repository (and if I try to install it from a deb package, it requires some incompatible dependencies). The configurator for QT5 apps qt5ct seems not to be able to apply its configuration to QT4 apps.

Is there a way to improve the fonts of QT4 apps in focal fossa? Please consider that the app fully works, it's only an aestetic matter.

VLC won't open GUI. Ubuntu 17.10 on X, all packages are up to date vlc:amd64/artful 2.2.6-6 uptodate. Tried system reboot and purging and re-installing VLC. VLC was installed with sudo apt install vlc. Here is the output in console:

matias@matias-System-Product-Name:~$ vlc
VLC media player 2.2.6 Umbrella (revision 2.2.6-0-g1aae78981c)
[000055fc8c43a918] core libvlc: Running vlc with the default interface.
Use 'cvlc' to use vlc without interface.
[000055fc8c550a28] skins2 interface error: no suitable dialogs provider
found (hint: compile the qt4 plugin, and make sure it is loaded properly)
[000055fc8c550a28] skins2 interface error: cannot instantiate qt4 dialogs provider
[000055fc8c550a28] [cli] lua interface: Listening on host "*console".
VLC media player 2.2.6 Umbrella
Command Line Interface initialized. Type `help' for help.
> 

Because it suggests a problem with Qt, I tried following the instructions here: Qt4 interface not working for VLC and installed Qt 5.10.1 but it didn't help (verification by qmake -version Using Qt version 5.10.1 in /opt/Qt/5.10.1/gcc_64/lib)

Using VLC via command line seems to work fine. Here is the output of vlc -vv https://pastebin.com/kC86TBN7

I tried to also tag skins2 but not enough rep.