deepin15.11升级deepin20

1、将15.11官方源替换成20官方源（/etc/apt/sources.list）
deb [by-hash=force] https://community-packages.deepin.com/deepin/ apricot main contrib non-free

• [原文](https://bbs.deepin.org/forum.php?mod=viewthread&tid=198112&extra=page%3D1）