Upgrade using command line

[hummeling]

I'm very fond of Linux Mint and run it on several systems including a server. Since the server doesn't have a monitor attached to it I'd like to upgrade from 20.3 to 21 but mintupgrade uses a GUI. Is it possible to run mintupgrade in headless mode, or should I use something like Remote Desktop to use the graphic interface?
Any other tips to use Mint on a server are welcome

[xenopeek]

No, mintupgrade requires using the GUI. You could upgrade the usual way for a server (pointing apt to the new repositories and asking it do the upgrade). If you break it, you fix it.

The mintupgrade tool is intended for desktop users and does checks and disables some things to avoid the most common upgrade problems encountered by users. Simple things like checking the computer is on AC power, there's a recent Timeshift snapshot, there is enough disk space and bit more complex making sure there are no held or foreign packages.

[all41]

and no compelling reason

[Hoser Rob]

Yeah, use the Mint programs. There are CLI ways to do these sort of things but in Ubuntu derived distros they have a nasty habit of turring the OS into a Frankenubuntu.