0228login:Penguin
2022/05/08(日) 18:39:53.24ID:1hAzAQVnSorry, not in Japanese right now.
I would like to recommend you to read the below:
MX Linux Forum > To manually upgrade Debian 10 Buster to Bullseye
https://forum.mxlinux.org/viewtopic.php?t=63337
Using PPA in Ubuntu Linux [Complete Guide]
https://itsfoss.com/ppa-guide/