Because you tried two different OSes and the point where it hangs is the point where the OS sends an APM/ACPI command to reboot / power off. This is the last thing the OS does. So if that’s not happening something is wrong with the hardware, BIOS, or BIOS settings.

You could try the syslog (journalctl), but logging is probably already off at that point.

Yeah that seems like a mainboard issue.

Both. Also some concepts may exist in one language and not the other.

Seems like it has a CLI. You can figure out how to do this action with a CLI command, then do something like find -name *mkv -exec ... to execute that command for all the files.

The binary is called apt-get. There are others like apt-cache etc.

Apt is a script that just figures out which binary to use and passes the arguments on.

• apt update -> apt-get update
• apt policy -> apt-cache policy

Its a concept called defense in depth. Without root login now you require the key AND sudo password.

Also, outside of self hosted you will have multiple people logging in. You want them to log in with their own users for logging and permission management.

What is in the debug log?