[Major] Qt5 installation instructions don't work on new Ubuntu versions

[niksirbi]

The installation instructions for Linux include sudo apt-get install qt5-default, but the qt-default package is no longer available for recent versions of Ubuntu.

Running sudo apt-get install qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools, as responses to the above-linked thread suggest, didn't do the trick for me, and neither did conda install pyqt, conda install qt or conda install qtpy.

No matter what I do (on ubuntu 23.04 or 23.10) I end up with one of these two errors when I try to run snub:

QObject::moveToThread: Current thread (0x1e155c0) is not the object's thread (0x2da9de0).
Cannot move to target thread (0x1e155c0)

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/niko/anaconda3/envs/snub2/lib/python3.8/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb, eglfs, minimal, minimalegl, offscreen, vnc, webgl.

Aborted (core dumped)

ImportError: $HOME/anaconda3/envs/snub3/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.30' not found (required by /usr/lib/x86_64-linux-gnu/libicuuc.so.72)

There should be a less brittle way of installing snub on recent Linux distros.

[calebweinreb]

This turned out to be an opencv-related issue. I got ubuntu installation to work by switching the opencv requirement to opencv-python==4.1.2.30. Nothing needs to be installed via apt-get.

pip install should work now as of version 0.0.13

[niksirbi]

Thanks @calebweinreb, I can confirm this works now! Good job getting rid of the apt-get dependency. I'm closing the issue.