I found this in VarLogDistupgradeMainlog.txt:
2019-04-30 09:37:13,698 DEBUG examining: 'deb http://archive.ubuntu.com/ubuntu
cosmic main restricted'
2019-04-30 09:37:13,699 DEBUG verifySourcesListEntry: deb
http://archive.ubuntu.com/ubuntu disco main restricted
2019-04-30 09:37:13,699 DEBUG url_downloadable:
http://archive.ubuntu.com/ubuntu/dists/disco/Release
2019-04-30 09:37:13,699 DEBUG s='http' n='archive.ubuntu.com'
p='/ubuntu/dists/disco/Release' q='' f=''
2019-04-30 09:37:13,715 DEBUG error from httplib: 'HTTP Error 403: Forbidden'
It seems like there is something wrong with your network connection.
This is something you'll need to sort out before you'll be able to
upgrade.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1826963
Title:
ubuntu 18.10
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