Ok. I see what I might have made wrong: trying to resurrect the session (pressing 'r')
I was able to reproduce it just this way:
After it asks for upgrade:
```
If you select 'y' the system will be restarted.
Continue [yN] y
I: molly-guard: reboot is always molly-guarded on this system.
Please type in hostname of the machine to reboot:
Good thing I asked; I won't reboot upgteste ...
=== Command detached from window (Wed Aug 19 21:24:36 2020) ===
=== Command terminated normally (Wed Aug 19 21:24:46 2020) ===
While scanning your repository information no entry about eoan could
be found.
An upgrade might not succeed.
Do you want to continue anyway?
Continue [yN] n
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Wed Aug 19 21:26:11 2020) ===
=== Command terminated with exit status 1 (Wed Aug 19 21:26:21 2020) ===
```
after that sources.list had bionic entries:
```
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://ports.ubuntu.com/ubuntu-ports bionic main restricted
# deb-src http://ports.ubuntu.com/ubuntu-ports bionic main restricted
...
```
Ok. I see what I might have made wrong: trying to resurrect the session (pressing 'r')
I was able to reproduce it just this way:
After it asks for upgrade:
```
If you select 'y' the system will be restarted.
Continue [yN] y
I: molly-guard: reboot is always molly-guarded on this system.
Please type in hostname of the machine to reboot:
Good thing I asked; I won't reboot upgteste ...
=== Command detached from window (Wed Aug 19 21:24:36 2020) ===
=== Command terminated normally (Wed Aug 19 21:24:46 2020) ===
Reading cache
Checking package manager ports.ubuntu. com/ubuntu- ports focal InRelease ports.ubuntu. com/ubuntu- ports focal-updates InRelease ports.ubuntu. com/ubuntu- ports focal-backports InRelease ports.ubuntu. com/ubuntu- ports focal-security InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://
Hit http://
Hit http://
Hit http://
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
No valid sources.list entry found
While scanning your repository information no entry about eoan could
be found.
An upgrade might not succeed.
Do you want to continue anyway?
Continue [yN] n
Restoring original system state
Aborting help.ubuntu. com/community/ UpgradeNotes for how to upgrade to ports.ubuntu. com/ubuntu- ports bionic main restricted ports.ubuntu. com/ubuntu- ports bionic main restricted
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Wed Aug 19 21:26:11 2020) ===
=== Command terminated with exit status 1 (Wed Aug 19 21:26:21 2020) ===
```
after that sources.list had bionic entries:
```
# See http://
# newer versions of the distribution.
deb http://
# deb-src http://
...
```
I understand it may invalidate the bug.