The point at which upgrade stops is after hitting bionic-backports. Here
are the logs from screen:
Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.
To continue please press [ENTER]
Hit http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu bionic InRelease
Hit http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu bionic-security
InRelease
Hit http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu bionic-updates
InRelease
Hit http://mirrors.piconets.webwerks.in/ubuntu-mirror/ubuntu bionic-backports
InRelease
Fetched 0 B in 0s (0 B/s)
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Tue Nov 13 10:33:09 2018) ===
=== Command terminated with exit status 1 (Tue Nov 13 10:33:19 2018) ===
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1803036
Title:
upgrade to 18.04 stops without errors
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1803036/+subscriptions
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