Score:-1

Can Not Update/Upgrade After Unregistered 2 versions' Ubuntu and Installed one Ubuntu as WSL

vc flag

Had successfully update and upgrade Ubuntu on WSL succesfully:

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then I unregistered the 2 version of Ubuntu and installed one Ubuntu. Got following errors:

enter image description here

Tried ~$ grep -nvr "^#" /etc/apt/ | grep impish, and got the following info:

grep: /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg: binary file matches

grep: /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg: binary file matches

Anyone could give hints? Thanks in advance!

Score:0
vc flag

I know the reason "the firewall blocks the DNS name resolution on the Linux subsystem" and the problem is solved

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