Can not upgrade to 21.04
Hi on trying to upgrade to 21.04 from 20.04 I get the below error message can you help me fix it . Wifi connection is secure
Ign http://
Err http://
404 Not Found [IP: 2001:67c:1562::18 80]
Fetched 0 B in 0s (0 B/s)
Error during update
A problem occurred during the update. This is usually some sort of
network problem, please check your network connection and retry.
W:Updating from such a repository can't be done securely, and is
therefore disabled by default., W:See apt-secure(8) manpage for
repository creation and user configuration details., E:The repository
'http://
have a Release file.
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