软件源问题

备份软件源:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

编辑软件源:
sudo gedit /etc/apt/sources.list 或者sudo vim /etc/apt/sources.list

更新软件源:获取软件列表
sudo apt-get update

 

更新已安装的包

sudo apt-get upgrade

 

清理无用的包

sudo apt-get autoclean