The same just happened for me during the installation:
```
[…]
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for menu (2.1.47ubuntu2.1) ...
Errors were encountered while processing:
virtualbox-ext-pack
libpython-all-dev:amd64
Upgrade complete
The upgrade has completed but there were errors during the upgrade
process.
To continue please press [ENTER]
=== Command terminated with exit status 1 (Thu Apr 30 11:44:28 2020) ===
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Starting pkgProblemResolver with broken count: 0
Starting 2 pkgProblemResolver with broken count: 0
Done
Hit http://ch.archive.ubuntu.com/ubuntu focal InRelease
Get:1 http://ch.archive.ubuntu.com/ubuntu focal-updates InRelease [97.0 kB]
Hit http://ch.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit http://archive.canonical.com/ubuntu focal InRelease
Get:2 http://security.ubuntu.com/ubuntu focal-security InRelease [101 kB]
Get:3 http://ch.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
[28.8 kB]
Get:4 http://ch.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages
[10.4 kB]
Get:5 http://ch.archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11
Metadata [14.6 kB]
Get:6 http://ch.archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages
[4’160 B]
Get:7 http://ch.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages
[5’888 B]
Get:8 http://security.ubuntu.com/ubuntu focal-security/main amd64 DEP-11
Metadata [14.6 kB]
Fetched 277 kB in 0s (0 B/s)
appstreamcli: symbol lookup error: appstreamcli: undefined symbol:
AS_APPSTREAM_METADATA_PATHS
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]
```
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https://bugs.launchpad.net/bugs/1873713
Title:
appstreamcli: symbol lookup error: appstreamcli: undefined symbol:
AS_APPSTREAM_METADATA_PATHS
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