I was able to recreate this by removing the /var/log/installer folder
and replacing it with a zero byte file.

bdmurray@clean-bionic-amd64:~$ sudo rm -fr /var/log/installer
[sudo] password for bdmurray:
bdmurray@clean-bionic-amd64:~$ sudo touch /var/log/installer
bdmurray@clean-bionic-amd64:~$ do-release-upgrade 
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                            
                                                                               
Get:2 Upgrade tool [1,243 kB]                                                   
                                                                               
Fetched 1,244 kB in 0s (0 B/s)                                                  
                                                                               
authenticate 'cosmic.tar.gz' against 'cosmic.tar.gz.gpg' 
extracting 'cosmic.tar.gz'
can't load DistUpgradeViewText ([Errno 20] Not a directory: 
'/var/log/installer/media-info')
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
Unable to init server: Could not connect: Connection refused
can't load DistUpgradeViewGtk3 ([Errno 20] Not a directory: 
'/var/log/installer/media-info')
can't load DistUpgradeViewKDE (No module named 'PyQt4')
can't load DistUpgradeViewText ([Errno 20] Not a directory: 
'/var/log/installer/media-info')
No view can be imported, aborting

Given that ubiquity creates the /var/log/installer folder and that I'm
unable to recreate this by just removing the folder I'm setting this to
a low priority.

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

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

** Summary changed:

- do-release-upgrade fails after cosmic.tar.gz extraction on 18.04.2 LTS
+ do-release-upgrade fails if /var/log/installer is a file

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https://bugs.launchpad.net/bugs/1826896

Title:
  do-release-upgrade fails if /var/log/installer is a file

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