Following instructions by PeterT for installing the non-flatpack version of Calibre 7.x I could start it from the Terminal but starting it from the icon in the Chrome OS start menu still failed until I did the following to add the environment variable:
from the Linux Terminal edit the file
/usr/share/applications/calibre-gui.desktop
I used vim, so:
sudo vim /usr/share/applications/calibre-gui.desktop
change the line:
Exec=calibre --detach %U
to read:
Exec=env QT_QPA_PLATFORM=xcb calibre --detach %U
If you haven't used vim or vi before it's a bit of a learning curve. type an i to enter insert mode, a q to quit insert mode and then
:wq
to write and quit vim.
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