I am trying to upgrade to 20.04 from 18.04 but the process is terminated automatically.
Terminal print out:
frepie@frepie-K55N:~$ 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://ca.archive.ubuntu.com/ubuntu bionic InRelease
Get:1 http://ca.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit http://ppa.launchpad.net/alexlarsson/flatpak/ubuntu bionic InRelease
Get:3 http://ca.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:4 https://repo.skype.com/deb stable InRelease [4,502 B]
Hit https://linux.teamviewer.com/deb stable InRelease
Hit https://packages.microsoft.com/repos/ms-teams stable InRelease
Hit http://ppa.launchpad.net/nixnote/nixnote2-stable/ubuntu bionic InRelease
Hit http://ppa.launchpad.net/obsproject/obs-studio/ubuntu bionic InRelease
Get:5 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 Metadata [51.3 kB]
Hit http://ppa.launchpad.net/team-xbmc/ppa/ubuntu bionic InRelease
Hit https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease
Get:6 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 Metadata [57.9 kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 DEP-11 Metadata [2,464 B]
Hit http://ppa.launchpad.net/tsbarnes/indicator-keylock/ubuntu bionic InRelease
Get:8 http://ca.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata [293 kB]
Get:9 http://ca.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata [295 kB]
Get:10 http://ca.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata [2,468 B]
Get:11 http://ca.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [9,272 B]
Err https://repo.skype.com/deb stable InRelease
The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <[email protected]>
Fetched 968 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
frepie@frepie-K55N:~$
