Articles under the label of upgrade

Debian9错误APT::Default-Release not available解决

错误执行sudo apt-get upgrade出现以下错误：E: The value '\stable' is invalid for APT::Default-Release as such a release is not available in the sources//或者E: 'stable' 这个值对 APT::Default-Release 是无效的，因为在源里找不到这样的...