one solution:
apt-get update //(更新目录)
apt-get upgrade //(更新文件)
apt-get dist-upgrade //(更新依赖关系)
two solution:
更换ubuntu的源
one solution:
apt-get update //(更新目录)
apt-get upgrade //(更新文件)
apt-get dist-upgrade //(更新依赖关系)
two solution:
更换ubuntu的源