First, enable debug logs:
$ DEBUG_UPDATE_MANAGER=1 do-release-upgrade
...
result of meta-release download: ''
...
So in my case, the connection failed due to the certification of the
proxy. Then change /usr/bin/do-release-upgrade to ignore this check.
Insert this code at the beginning of /usr/bin
Posted a 10 USD bounty on this issue:
https://www.bountysource.com/issues/96530138-do-release-upgrade-ignores-apt-proxy-exemption
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https://bugs.launchpad.net/bugs/1913240
Title:
do-rele
