ALTERNATIVE OF NOTEPAD++ IN LINUX (NOTEPAD NEXT)

install flatpak - sudo apt install flatpak -y

goto this site ('https://flathub.org/apps/details/com.github.dail8859.NotepadNext') download file

Then type this command - flatpak install com.github.dail8859.NotepadNext.flatpakref or ("Filename") that you have downloaded

say yes to every file

to run file - flatpak run com.github.dail8859.NotepadNext