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How to upgrade to Ubuntu 20.04?

in flag

from my daily update notification I have received messages, many times, that upgrade of 20.04 Ubuntu OS is available. But after i press the upgrade button the final result is Authentication failed, that is coming with explanation that whether the problem is with the server or network. Do not have any problems with my network so, the only option is problem with the server. How can i fix it, how to upgrade to Ubuntu 20.04? Upgrade av3my network so, the only option is problem with the server. How can i fix it, how to upgrade to Ubuntu 20.04? (see the pictures)[![Upgrade available][1]2

UpUpgrade 2grade available

upgrade number 3

N0rbert avatar
zw flag
Do you use proxy server?
in flag
I am using Main server from ubuntu.com, is that ok?
mangohost

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