A connection timeout occurs when Ubuntu updates resource packages:
Unable to initiate a connection to cn.archive.ubuntu.com:80 (2403:2c80:5::6) - connect (101: The network is unreachable) Unable to connect to cn.archive .ubuntu.com:80 (45.125.0.6), connection timeout
Reading package list... Done
W: Unable to download http://cn.archive.ubuntu.com/ubuntu/dists/focal/InRelease Unable to initiate connection with cn. Archive.ubuntu.com:80 (2403:2c80:5::6) connection - connect (101: Network unreachable) Unable to connect to cn.archive.ubuntu.com:80 (45.125.0.6), connection timed out
W: Some index files failed to download. If you omit them, the old index files will be used instead.
The error message is as shown below:
The reason is that the Ubuntu server is abroad, and updates when downloading using domestic software sources are restricted, so the service address must be changed to a domestic address. Just replace
everything in the /etc/apt/sources.list file with . You can choose to back up this file first to prevent it from being restored later:cn.archive.ubuntu.commirrors.aliyun.com
cd /etc/apt
sudo tar -zcvf sources.list.tar.gz sources.list
As shown in the figure, a compressed package of a file is backed up.
Then vim goes into the file and changes it:
sudo vim sources.list
Press i to insert to start modification. After modification, press esc key –> colon: --> wq to save and exit.