apt update或aptitude update不能更新問題

refered: https://bugs.launchpad.net/linuxmint/+bug/812080

訊息:
E: Release file expired, ignoring xxxURL/InRelease (invalid since xxxd xxxh xxxmin xxxs)

修正fix:
sudo vi /etc/apt/apt.conf.d/80myupdate-debian

Acquire::Check-Valid-Until "false";