kbackgroundsnapshot: 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 CentOS possible default full paths are:

/usr/bin/kbackgroundsnapshot - from package: kdegraphics

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/kbackgroundsnapshot - from package: ksnapshot

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

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