nthseqset: 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/nthseqset - from package: emboss

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

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