Installation fails under Ubuntu 20.04

[carnap64]

I use Ubuntu 20.04 and I am interested in the program Blivet-GUI.
So I went to https://software.opensuse.org/downloage=blivet-gui and tried to add the package source to my repo. However, I received the following error message:

`The application package source may no longer be available or may be unreachable due to network problems. If an older package list is still available for this application package source, it is used. Otherwise, this application package source is ignored altogether. Please check your network connection and also make sure that the application package source address is correctly entered in the settings.

File "home:vtref" in directory "/etc/apt/sources.list.d/" is ignored because it has no file name extension.File "home:vtrefny." in directory "/etc/apt/sources.list.d/" is ignored because it has an invalid file name extension.File "home:vtref" in directory "/etc/apt/sources.list.d/" is ignored because it has no file name extension. File "home:vtrefny." in directory "/etc/apt/sources.list.d/" is ignored because it has an invalid file name extension.GPG error: http://download.opensuse.org/repositories/home:/vtrefny/xUbuntu_20.04 InRelease: The following signatures could not be verified because their public key is not available: NO_PUBKEY 70F72613FAEF25AFDThe "http://download.opensuse.org/repositories/home:/vtrefny/xUbuntu_20.04 InRelease" repository is not signed. `

[Vojtech Trefny]

Please follow the instructions for Ubuntu 20.04 available here: https://software.opensuse.org/download.html?project=home:vtrefny&package=blivet-gui

I've tried with a fresh installation of Ubuntu 20.04 and it works for me.

echo 'deb http://download.opensuse.org/repositories/home:/vtrefny/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/home:vtrefny.list
curl -fsSL https://download.opensuse.org/repositories/home:vtrefny/xUbuntu_20.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_vtrefny.gpg > /dev/null
sudo apt update
sudo apt install blivet-gui

You might need to check /etc/apt/sources.list.d and remove the repository you added first. Also make sure you have curl installed.