Public bug reported:
I'm trying to upgrade from 19.10 to 20.04 (devel). Unfortunately, the
do-release-upgrade process aborts after "Calculating the changes" without
saying why:
```
sudo do-release-upgrade -d
```
```
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]
Get:2 Upgrade tool [1,334 kB]
Fetched 1,335 kB in 0s (0 B/s)
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg'
extracting 'focal.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://de.archive.ubuntu.com/ubuntu eoan InRelease
Hit http://de.archive.ubuntu.com/ubuntu eoan-updates InRelease
Ign http://dl.google.com/linux/chrome/deb stable InRelease
Hit http://ppa.launchpad.net/nschloe/inkscape-backports/ubuntu eoan InRelease
Hit http://de.archive.ubuntu.com/ubuntu eoan-backports InRelease
Hit http://dl.google.com/linux/chrome/deb stable Release
Hit http://ppa.launchpad.net/nschloe/mmg-test/ubuntu eoan InRelease
Hit http://ppa.launchpad.net/nschloe/trilinos-backports/ubuntu eoan InRelease
Ign https://dl.bintray.com/etcher/debian stable InRelease
Get:1 https://dl.bintray.com/etcher/debian stable Release [3,674 B]
Fetched 3,674 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Updating repository information
Third party sources disabled
Some third party entries in your sources.list were disabled. You can
re-enable them after the upgrade with the 'software-properties' tool
or your package manager.
To continue please press [ENTER]
Hit http://de.archive.ubuntu.com/ubuntu eoan InRelease
Hit http://de.archive.ubuntu.com/ubuntu eoan-updates InRelease
Hit http://de.archive.ubuntu.com/ubuntu eoan-backports InRelease
Fetched 0 B in 0s (0 B/s)
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
```
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1851475
Title:
aborting without informative error message
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