Comment 21 for bug 1761997

$ sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1,263 kB]
Fetched 1,264 kB in 0s (0 B/s)
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'
Directory '/var/run/screen' must have mode 777.

$ screen
Directory '/var/run/screen' must have mode 777.

$ ls -lat /run/screen
total 0
drwxr-xr-x 29 root root 1260 Dec 8 01:42 ..
drwxrwxr-x 2 root utmp 40 Dec 6 20:36 .

$ sudo service screen-cleanup status
● screen-cleanup.service
   Loaded: masked (/dev/null; bad)
   Active: inactive (dead)

$ ls -lh /lib/systemd/system/screen-cleanup
ls: cannot access '/lib/systemd/system/screen-cleanup': No such file
or directory

$ cat /etc/tmpfiles.d/screen-cleanup.conf
cat: /etc/tmpfiles.d/screen-cleanup.conf: No such file or directory