lskpatches: 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/lskpatches - from package: kernel-patch-scripts

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

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