Looking at your log files you don't seem to have the linux-generic package installed and it is failing to install due to a hold on the package linux-headers-generic. Please resolve this issue by installing linux-generic and upgrading linux-headers-generic and then trying the upgrade again. Thanks!
>From Aptlog.txt: MarkInstall linux-generic [ amd64 ] < none -> 4.15.0.32.34 > ( kernel ) FU=1 Installing linux-headers-generic as Depends of linux-generic Ignore MarkInstall of linux-headers-generic [ amd64 ] < 4.4.0.119.125 -> 4.15.0.32.34 > ( devel ) as its mode (Keep) is protected Starting pkgProblemResolver with broken count: 1 Starting 2 pkgProblemResolver with broken count: 1 Investigating (0) linux-generic [ amd64 ] < none -> 4.15.0.32.34 > ( kernel ) Broken linux-generic:amd64 Depends on linux-headers-generic [ amd64 ] < 4.4.0.119.125 -> 4.15.0.32.34 > ( devel ) (= 4.15.0.32.34) Considering linux-headers-generic:amd64 -1 as a solution to linux-generic:amd64 9999 Ignore MarkInstall of linux-headers-generic [ amd64 ] < 4.4.0.119.125 -> 4.15.0.32.34 > ( devel ) as its mode (Keep) is protected Re-Instated linux-headers-generic:amd64 Done ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete ** Summary changed: - Can't do a sys upgrade from 16.04 to 18.04.1 LTS + Can't do a sys upgrade from 16.04 to 18.04.1 LTS due to linux-generic not being installed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1787658 Title: Can't do a sys upgrade from 16.04 to 18.04.1 LTS due to linux-generic not being installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1787658/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs