更新阿里源 清华源 apt依然有很多包 无法安装 git

karl-majors

firefly@firefly:/opt$ sudo apt install git
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Package git is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'git' has no installation candidate


不管怎么更新apt源或者update  无法下载git  导致解压缩Linuxsdk都报错

包括其他的包
sudo apt-get install build-essential lzop libncurses5-dev libssl-dev
都找不到