This looks like a transient network error:
2025-05-29 11:42:19,048 DEBUG examining: 'deb
http://be.archive.ubuntu.com/ubuntu/ bionic main restricted'
2025-05-29 11:42:19,049 DEBUG verifySourcesListEntry: deb
http://be.archive.ubuntu.com/ubuntu/ focal main restricted
2025-05-29 11:42:19,049 DEBUG url_downloadable:
http://be.archive.ubuntu.com/ubuntu//dists/focal/Release
2025-05-29 11:42:19,049 DEBUG s='http' n='be.archive.ubuntu.com'
p='/ubuntu//dists/focal/Release' q='' f=''
2025-05-29 11:42:37,230 DEBUG error from httplib: '[Errno 104] Verbinding is
weggevallen'
Please try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2112099
Title:
No update possible fron vers.18 into 20.04
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