I doubt that the problem is related to the kernel update, but that is the circumstance.
There are a great many topics in this forum about the same or related subjects, but most seem to have been resolved by interventions that have not worked for me thus far.
When I first did
mate-panel --reset, I got “Cannot register the panel shell: there is already one running”, which is true:
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$ ps -ef | grep panel user 1680 1518 0 20:47 ? 00:00:00 mate-panel user 1716 1497 0 20:47 ? 00:00:00 /usr/lib/mate-panel/clock-applet user 1719 1497 0 20:47 ? 00:00:00 /usr/lib/mate-panel/notification-area-applet user 1722 1497 0 20:47 ? 00:00:00 /usr/lib/mate-panel/wnck-applet
mate-panel --replace, but that command just got stuck; sitting there, not using any CPU.
When I tried
mate-panel --resetagain, it got stuck also, and from then I couldn’t get the system menu anymore (neither via Alt+F1 nor the super key), so I had to reboot again. (Invoked the shutdown command from terminal.)
Any help would be much appreciated.
Kernel 5.3.0-61-generic x86_64 (previous was 5.3.0-53)