I tried recreating this and while the system did not reboot sources.list was not restored to bionic.
bdmurray@clean-bionic-amd64:~$ tail /var/log/dist-upgrade/screenlog.0 System upgrade is complete.
Restart required
To finish the upgrade, a restart is required. If you select 'y' the system will be restarted.
Continue [yN] y
=== Command terminated normally (Mon Aug 3 18:44:27 2020) === bdmurray@clean-bionic-amd64:~$ cat /etc/apt/sources.list deb http://192.168.10.7/ubuntu focal main restricted universe multiverse deb http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse # deb http://archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse deb http://192.168.10.7/ubuntu focal-security main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal-updates main restricted universe multiverse # deb-src http://archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse deb-src http://192.168.10.7/ubuntu focal-security main restricted universe multiverse bdmurray@clean-bionic-amd64:~$ ls -lh /sbin/reboot lrwxrwxrwx 1 root root 28 Jul 9 2019 /sbin/reboot -> /lib/molly-guard/molly-guard
I tried recreating this and while the system did not reboot sources.list was not restored to bionic.
bdmurray@ clean-bionic- amd64:~ $ tail /var/log/ dist-upgrade/ screenlog. 0
System upgrade is complete.
Restart required
To finish the upgrade, a restart is required.
If you select 'y' the system will be restarted.
Continue [yN] y
=== Command terminated normally (Mon Aug 3 18:44:27 2020) === clean-bionic- amd64:~ $ cat /etc/apt/ sources. list 192.168. 10.7/ubuntu focal main restricted universe multiverse 192.168. 10.7/ubuntu focal-updates main restricted universe multiverse archive. ubuntu. com/ubuntu bionic-proposed main restricted universe multiverse 192.168. 10.7/ubuntu focal-security main restricted universe multiverse 192.168. 10.7/ubuntu focal main restricted universe multiverse 192.168. 10.7/ubuntu focal-updates main restricted universe multiverse archive. ubuntu. com/ubuntu bionic-proposed main restricted universe multiverse 192.168. 10.7/ubuntu focal-security main restricted universe multiverse clean-bionic- amd64:~ $ ls -lh /sbin/reboot guard/molly- guard
bdmurray@
deb http://
deb http://
# deb http://
deb http://
deb-src http://
deb-src http://
# deb-src http://
deb-src http://
bdmurray@
lrwxrwxrwx 1 root root 28 Jul 9 2019 /sbin/reboot -> /lib/molly-