debsums_init: 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/sbin/debsums_init - from package: debsums

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

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