First, enable debug logs:
$ DEBUG_UPDATE_MANAGER=1 do-release-upgrade
...
result of meta-release download: '<urlopen error [SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate
in certificate chain (_ssl.c:1131)>'
...
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/do-release-upgrade file
but after the '__future__' line:
from __future__ import print_function
import ssl
try:
_create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
pass
else:
ssl._create_default_https_context = _create_unverified_https_context
ok, now it works!
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https://bugs.launchpad.net/bugs/1913240
Title:
do-release-upgrade ignores APT proxy exemption
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