apper-appsetup: command not found

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/apper-appsetup - from package: apper

You may install the required package with command apt-get install {package}

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