Recently, the 11th point release of Debian 11 has been announced, and it will be the last one. For I am still maintaining one Debian 11 machine, I am starting to prepare its upgrade to Debian 12. Because it is a dual boot machine, I must not forget about the change of grub OS probing. Before I ugrade, I have to add GRUB_DISABLE_OS_PROBER=false to / etc/default/grub, or I lose grub menu for Windows OS. Another thing that impacts me is the change of gnome-text-editor. In Debian 11, gnome-text-editor is a kind of alias of gedit controlled under the Debian alternative system with update-alternatives command. On the other hand, a new package gnome-text-editor appears in Debian 12, and it is a different thing from gedit. For I am an uim user, I was confused when I tried to use launch a Japanese input method via uim on gnome-text-editor in Debian 12, for it wouldn't work as in Debian 11. Yes, these two things are important reminder to me.