I'm not sure everyone facing this issue or not. When I update or install something on my Ubuntu 14.04 server, it always uses "sg.archive.ubuntu.com" Singapore mirror and it's working during weekdays and failed on weekend Sat and Sun. So I make changes on the apt repository. $sudo vim /etc/apt/source.list comment out # deb http://sg.archive.ubuntu.com/xxxx and add deb http://au.archive.ubuntu.com/xxx then run the command apt-get update then solve the issue.
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