Can't access to system, problem with Main.qml

[wonder]

Hello Leszek.
Now, I try with my friend this solution, but not work because, the files /etc/apt/sources.list.d/maui-backports.list and maui-backports-neon.list  no exist in sources.list.d directory.

This is the her files:


Can't edit fhis files por activate backports because not exist in this directory.

How can made this?

Thanks and regards.