After a long time I opened by system and trying to upgrade Ubuntu from 18.04.06 LTS to 20.04.3. But Its not working. As there is no error message I am unable to figure out the issue. After few minutes in the upgrade window, it shutdown without any error. Anyone faced the same issue.
Below is the output when done through command prompt.
~$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]
Get:2 Upgrade tool [1,340 kB]
Fetched 1,342 kB in 0s (0 B/s)
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://archive.ubuntu.com/ubuntu bionic InRelease
Hit http://linux.teamviewer.com/deb stable InRelease
Get:1 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic InRelease
Hit https://download.docker.com/linux/ubuntu bionic InRelease
Hit http://dl.google.com/linux/chrome/deb stable InRelease
Hit http://ppa.launchpad.net/openjdk-r/ppa/ubuntu bionic InRelease
Hit http://packages.microsoft.com/repos/code stable InRelease
Hit http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Hit http://ppa.launchpad.net/webupd8team/java/ubuntu bionic InRelease
Get:2 http://archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Fetched 177 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Result of running systemctl status snapd.service
● snapd.service - Snap Daemon
Loaded: loaded (/lib/systemd/system/snapd.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2022-01-08 20:37:42 CET; 7min ago
Process: 1978 ExecStart=/usr/lib/snapd/snapd (code=exited, status=1/FAILURE)
Main PID: 1978 (code=exited, status=1/FAILURE)
Jan 08 20:37:42 sambit systemd[1]: snapd.service: Service hold-off time over, scheduling restart.
Jan 08 20:37:42 sambit systemd[1]: snapd.service: Scheduled restart job, restart counter is at 6.
Jan 08 20:37:42 sambit systemd[1]: Stopped Snap Daemon.
Jan 08 20:37:42 sambit systemd[1]: snapd.service: Start request repeated too quickly.
Jan 08 20:37:42 sambit systemd[1]: snapd.service: Failed with result 'exit-code'.
Jan 08 20:37:42 sambit systemd[1]: Failed to start Snap Daemon.
Jan 08 20:37:42 sambit systemd[1]: snapd.service: Triggering OnFailure= dependencies.
