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Never seen that... Probably the upgrade would remove some package(s) that mintsystem depends on. Can you please post the full output where apt shows all the packages that would be upgraded/removed? (use the "code" tag for it, that output is usually quite big) mintsystem was installed as a dependency...

I've checked the installer... yes, it indeed places /dev/sda into /etc/crypttab and /etc/default/grub.d/61_live-installer.cfg.

Looks similar to what's described in viewtopic.php?p=1797728#p1797728...

This laptop has two internal drives, when I disconnect the other drive, it works! It boots with my password. However, as soon as I plug in the other drive, it again doesn't accept my real password. Another odd thing is that the other drive is just storage, there's no boot partition nor boot loader,...

Ah, I hadn't actually clocked the question was in the LMDE section. Interesting how the equivalent flatpak path does make it to XDG_DATA_DIRS though - I guess the Mint team have tweaked something in LMDE to make that work out of the box. I'm surprised the snapd developers haven't implemented a work...

It would be more helpful to see the full error message (with the "broken" package names), but in case it's about libfaudio0, there's a workaround posted at https://wiki.winehq.org/Debian.

So... snapd actually sets $XDG_DATA_DIRS in /etc/profile.d/apps-bin-path.sh, but that file isn't used in the graphical logins in Debian: viewtopic.php?f=247&t=278474

Unfortunately, this installer doesn't have such option for the automated installation. It can be done only in the manual partitioning mode.

There is systemd service + timer in Debian 10, but it's disabled by default, you need to enable it: Periodic fstrim for SSD disks ----------------------------- fstrim(8) is used on a mounted filesystem to discard blocks which are not in use by the filesystem. This is useful in particular for solid-s...

It is. 6.0.3.1 is for 19.3, 5.9.1.2 is for LMDE 3 and 4.

In Debian Stretch you would get 390.116 as the current driver (without using backports), in Debian Buster that version is in the legacy package.

Would the official Debian documentation help?

https://wiki.debian.org/NvidiaGraphicsDrivers

That's probably not related to the upgrade - though you can check it by booting the live ISO of LMDE 4 (or installing it on some free partition)...

Good
So the problem was in the old backup?

Just in case, was your system previously upgraded from LMDE 2 Betsy?
If so, it could be that old APT sources backup was left in ~/Upgrade-Backup/APT directory.

Looks like it's LMDE 3, but repos are set to LMDE 2 for some reason. Use "Restore the default settings" button in Software Sources.

(also your post has a duplicate output instead of cat /etc/linuxmint/info)

This looks weird... these are package versions from Debian 8 Jessie, on which LMDE 2 is based.
Please post the output of:

You can run the installer from the terminal to see more details:

BTW, in LMDE 4 the backports are already enabled.

Announcement: https://blog.linuxmint.com/?p=3860