列出所有repository
apt policy
apt policy
apt policy
移除repository
sudo add-apt-repository –remove ppa:[PPA_REPOSITORY_NAME]/[PPA]
如
sudo add-apt-repository --remove ppa:webupd8team/java
sudo add-apt-repository --remove ppa:webupd8team/java
sudo add-apt-repository --remove ppa:webupd8team/java
