我是一个linux新手。我想删除一个程序，不小心输入了sudo rm -r /snap.现在我无法启动某些程序。
例如，当我opera在终端中输入打开歌剧时，它会显示
Command 'opera' not found, but can be installed with:
sudo snap install opera
但当我输入时sudo snap install opera它说
snap "opera" is already installed, see 'snap help refresh'
如果我尝试rm opera它说
rm: cannot remove 'opera': No such file or directory
我该怎么办？