warpMár májusban... (az egyik blog dátuma).
Teendő:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install update-manager-core
sudo systemctl reboot
sudo apt-get autoremove --purge
Aztán (a grafikus megoldást mutatom, a többi a blogokban):
do-release-upgrade -d -f DistUpgradeViewGtk3
Ha nem kéri be a rendszer a jelszavad, akkor próbáld így (adminként a grafikus alkalmazást):
pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY do-release-upgrade -d -f DistUpgradeViewGtk3
Forrás:
How to upgrade from Ubuntu 18.04 LTS to 20.04 LTS today
Upgrade Ubuntu 18.04 to 20.04 LTS using command line
Kézikönyv:
sudo do-release-upgrade -h
Usage: do-release-upgrade [options]
Options:
-h, --help show this help message and exit
-V, --version Show version and exit
-d, --devel-release
If using the latest supported release, upgrade to
the development release
--data-dir=DATA_DIR
Directory that contains the data files
-p, --proposed
Try upgrading to the latest release using the
upgrader from $distro-proposed
-m MODE, --mode=MODE
Run in a special upgrade mode. Currently
'desktop' for regular upgrades of a desktop
system and 'server' for server systems are
supported.
-f FRONTEND, --frontend=FRONTEND
Run the specified frontend
-c, --check-dist-upgrade-only
Check only if a new distribution release is
available and report the result via the exit code
--allow-third-party Try the upgrade with third party mirrors and
repositories enabled instead of commenting them
out.
-q, --quiet
Aztán lehet, ez csak a B terv. :)