kritagemini: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/kritagemini - from package: krita-gemini

You may install the required package with command apt-get install {package}
Error in other languages:
kritagemini: bevel nie gevind nie
kritagemini: comandă negăsită
kritagemini: comando não encontrado
kritagemini: commande introuvable
kritagemini: command not found
kritagemini: käsku ei ole
kritagemini: không tìm thấy lệnh
kritagemini: komanda nerasta
kritagemini: Kommando nicht gefunden.
kritagemini: kommandot finns inte
kritagemini: komut yok
kritagemini: nie znaleziono polecenia
kritagemini: níor aimsíodh an t-ordú
kritagemini: no se encontró la orden
kritagemini: no s'ha trobat l'ordre
kritagemini: opdracht niet gevonden
kritagemini: parancs nem található
kritagemini: perintah tidak ditemukan
kritagemini: príkaz nenájdený
kritagemini: příkaz nenalezen
kritagemini: команда не найдена
kritagemini: командата не е открита
kritagemini: 命令找不到
kritagemini: コマンドが見つかりません