Public bug reported:

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1250 kB]
Fetched 1251 kB in 0s (0 B/s)
authenticate 'cosmic.tar.gz' against 'cosmic.tar.gz.gpg'
extracting 'cosmic.tar.gz'

A fatal error occurred

Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade has aborted.
Your original sources.list was saved in

Traceback (most recent call last):

File "/tmp/ubuntu-release-upgrader-wvzfz5ou/cosmic", line 8, in

line 224, in main
from .DistUpgradeController import DistUpgradeController

line 25, in <module>
import distro_info

ModuleNotFoundError: No module named 'distro_info'

This a result of the SRU of the fix for bug 1799310 while the new
dependency was added to the cosmic version of u-r-u that doesn't help
because the dist-upgrader tarball doesn't reflect that dependency.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: ubuntu-release-upgrader (Ubuntu Bionic)
     Importance: Medium
         Status: Triaged

** Also affects: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Fix Released

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  python3-distupgrade missing a dep on python3-distro-info

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