我正在尝试安装异类支持端口:
sudo apt-get install -t xenial-backports但我知道这个错误:
Reading package lists... Done
E: The value 'xenial-backports' is invalid for APT::Default-Release as such a release is not
available in the sources知道怎么解决这个问题吗?
https://askubuntu.com/questions/1280275
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