Debian 10 자동 로그인 - lightdmcfg 저장소 문제

나는 팔로우하고 있다 데비안 10에서 자동 로그인하는 방법은 무엇입니까?. 스크린샷에서 볼 수 있듯이 이는 결국 Debian 10 설치가 찾을 수 없는 Ubuntu 저장소를 가리키게 되었습니다.

해결책이 있나요?

 root@hpdb:/home/stephen# add-apt-repository ppa:fsnow/ppa

  More info: https://launchpad.net/~fsnow/+archive/ubuntu/ppa
 Press [ENTER] to continue or ctrl-c to cancel adding it

 gpg: keybox '/tmp/tmp64_53n2s/pubring.gpg' created
 gpg: /tmp/tmp64_53n2s/trustdb.gpg: trustdb created
 gpg: key A3C2E0B93BF8E342: public key "Launchpad PPA for FSnow" imported
 gpg: Total number processed: 1
 gpg:               imported: 1
 gpg: no valid OpenPGP data found.
 root@hpdb:/home/stephen# sudo apt-get install lightdmcfg  
 Reading package lists... Done
 Building dependency tree       
 Reading state information... Done
 E: Unable to locate package lightdmcfg
 root@hpdb:/home/stephen# apt update
 Hit:1 http://deb.debian.org/debian buster InRelease
 Hit:2 http://deb.debian.org/debian buster-updates InRelease                    
 Hit:3 http://security.debian.org/debian-security buster/updates InRelease      
 Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease                   
 Hit:5 http://dl.google.com/linux/chrome/deb stable Release   
 Ign:6 http://ppa.launchpad.net/fsnow/ppa/ubuntu focal InRelease
 Err:7 http://ppa.launchpad.net/fsnow/ppa/ubuntu focal Release
   404  Not Found [IP: 2001:67c:1560:8008::15 80]