Install cmake ubuntu18.04
Sudo add apt - repository ppa: George - edison55/cmake - 3. The x-y
Error:
Err: 4 http://ppa.launchpad.net/george-edison55/cmake-3.x/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80]
Err: 5 http://cn.archive.ubuntu.com/ubuntu bionic - backports InRelease
The Connection failed [IP: 91.189.91.14 80]

In the/etc/apt/sources list, update the domestic source,
In the/etc/apt/sources list. D directory, only a George - edison55 - ubuntu - cmake - 3 _x - bionic. List file
It is only 1:
Deb http://ppa.launchpad.net/george-edison55/cmake-3.x/ubuntu bionic main
Remove after the operation and automatic generation of the sentence, how?