seqcount: 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/seqcount - from package: emboss

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

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