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If the path should have been /usr/bin/obmenu then the openbox package has been build with a wrong path name.

Output from apt content openbox:
/usr
/usr/bin
/usr/bin/gdm-control
/usr/bin/obamenu
/usr/bin/obxprop
/usr/bin/openbox
/usr/bin/openbox-session

Seems that the openbox package in LMDE4 is broken.
When I try to open to the applications menu entry, I receive an error msg telling me that the path '/usr/bin/obamenu' is not valid.

Debian (and thus LMDE4) is unlike Arch & derviates a jumping release not a rolling one.
So you are stuck with the 'boxed' kernel until the next major release unless you manually install the latest kernel image from the buster-backports repo.

You probably missed some info here.
Mint (or Debian) does not support Canonical's snap crap.

Try upgrading your firmware-intel-sound from buster-backports and I'd also recommend to get the latest 5.10 kernel from there (linux-image-amd64)

Wayland vs. Xorg?

Why the use of such an old and deprecated kernel, I wonder?

The same happened upon updating to Firefox 78.8.0esr

Upon updating Firefox to 78.7.1esr, I received the following error msg: Trigger für mintsystem (8.5.1) werden verarbeitet ... File "/usr/share/linuxmint/adjustments/15-debian-system-adjustments.execute", line 16 except Exception, detail: ^ SyntaxError: invalid syntax Traceback (most recent...

Debian Bullseye supports the latest Cinnamon DE 4.8.6, but it's ofc lacking the decidedly 'mint' packages like mintinstall, mintupdate, mintwelcome.

This may link help you:
https://www.linuxcompatible.org/story/d ... ve-images/

If you don't know how to handle 'dmesg' in the terminal, then run 'gnome-logs' from the menu and filter for the system error messages.

Without further info on your hardware/GPU nobody will be able to really help you.
Run 'inxi -Fxxxz' and post the output here.
Please use </> code tags for the output.

Try again running ' systemd-analyze blame'

Upon trying to open a 8mb text file created with notepad++ I get an error message that this file cannot be opened due to encoding problems. Encoding problems in a text file, I thought and opened it with 'wine notepad' instead to take a look. There I saw upon saving the file that it was encoded in UT...

Does your machine run on the terminal (tty1 to tty7)? If so, then its 'merely' a crash of the X server or possibly lightdm.
Have you looked at /var/log/Xorg.0.log and what does it tell you?
Have yo tried the 'nomodeset' kernel option yet?

The 'energy settings' in Linux Mint is a piece of junk that for me never worked properly with any external display I connected.

After the upgrade to 20.1 neofetch only shows 'DE = Cinnamon' but no longer the installed version.

Got the below error message upon updating today. Anyone else? Trigger für mintsystem (8.5.0) werden verarbeitet ... File "/usr/share/linuxmint/adjustments/15-debian-system-adjustments.execute", line 16 except Exception, detail: ^ SyntaxError: invalid syntax Traceback (most recent call last...

While copying a file to a USB stick the progress bar never updates.
It remains at 0% the whole time and when the copying is done it disappears without any notification.

sudo lightdm-settings > User tab