seqretsetall: 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/bin/seqretsetall - from package: emboss

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