do-release-upgrade had errors, seemed OK

[Leroy Tennison]

I got a message that an upgrade from 16.04 to 18.04 finished with errors but things seemed OK on reboot.  I'm a little hesitant to go into production, are there things I can check to insure the errors weren't critical?  I filed Bug #1922529 with the requested files, thanks for your help.
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