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Release upgrade to 14 failed with a Python exception

rated 0 times [ 0] [ 0] / answers: 1 / hits: 677 / 3 Years ago, tue, july 20, 2021, 11:41:56

So I attempted to upgrade by running

sudo do-release-upgrade

as it specifies in my login prompt. It runs for about a minute before crashing with the error:

AttributeError: 'AptCdrom' object has no attribute 'restore_backup'

Can I assume this is a bug and that I won't be able to upgrade from the command line?

Is there any workaround?

Edit: This is a headless server.

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tigehanc

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4 Years ago

answered 3 Years ago mouedi · Accepted Answer

The problem was due to an old postgresql package that had somehow been blacklisted from removal. Since the upgrade required this package to be uninstalled, but couldn't due to the blacklist, it failed, but this true error was hidden in the logs and only this Python traceback was immediately visible.

Manually removing the package then re-running sudo do-release-upgrade fixed the error.

cat /var/log/dist-upgrade/main.log|less

...

Dist-upgrade failed: 'The package 'postgresql-9.4-postgis-2.1' is marked for removal but it is in the removal blacklist.'