Upgrade to Linux Mint 19 (Ubuntu 18.04)

I recently upgraded from Linux Mint 18.3 to the latest version, Linux Mint 19. I did this so I could test and eventually update my VGA passthrough tutorial. There was no other practical reason for me to upgrade.

I did the upgrade twice:

  1. Using the mintupgrade tool provided by Linux Mint. This allowed me to upgrade my existing Linux Mint installation and all installed applications.
    The upgrade went surprisingly smooth, with only minor glitches. However, in the end I decided to reinstall the Linux Mint 19 system from scratch (see 2. below).
  2. Install the entire operating system from the downloaded ISO, while preserving the /home director (my user directory) and all other data.
    This was quite a pain in the neck, as it turned out.

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