OK, this does seem to be a wxGTK problem and I did used to have to start Audacity in 18.04 using the command
Code:
bash -c "GTK_IM_MODULE=; audacity %F"
in the desktop launcher file.
It may be that updates to the versions of various libwxgtk and wxwidgets packages have overcome this, and I always use a clean install of ther OS, now 20.04, not an upgrade, and also with Xubuntu, ie, Xfce4 not gnome.
Try that start command to see if it works for you; make sure you don't miss the " " in that command or it will certainly fail.
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