CopyQ crashes on Ubuntu

[thoefkens]

Before creating a new issue, see list of known
issues.

Describe the bug
When I open copyQ's "clipped" screen to select clipboard entries, the screen background is blue.
When I go into the settings of copyQ and click "appearance", copyQ hangs, gets killed and crashes.

To Reproduce
Steps to reproduce the behavior:

1. Go to CopyQ - Preferences
2. Click on Appearance
   CopyQ crashes.

Attached a screenshot of starting copyQ with debug, then going to appearance.

Screenshots
If applicable, add screenshots to help explain your problem.

Version, OS and Environment
Ubuntu 22.04.4
CopyQ 6.0.1

[hluk]

CopyQ 6.0.1 is very old release. Please update to a newer version.

It should be possible to install the latest version from PPA. See: https://copyq.readthedocs.io/en/latest/installation.html