tar-restore: 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/sbin/tar-restore - from package: tar-scripts

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