Please! open terminal and do this before starting (100% worked)
sudo nano /etc/resolv.conf
then enter these two line in resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
save
then install resolvconf and follow the video instruction
Temporary failure resolving error on Ubuntu 20.04 Focal Fossa Linux
How to resolve "Temporary failure in name resolution" issue and Set Permanent DNS Nameservers in Ubuntu and Debian and Ubuntu updates – Temporary failure resolving ‘archive.ubuntu.com’
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