asn2ff: 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/asn2ff - from package: ncbi-tools-bin

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

Error in other languages:
asn2ff: bevel nie gevind nie
asn2ff: comandă negăsită
asn2ff: comando não encontrado
asn2ff: commande introuvable
asn2ff: command not found
asn2ff: käsku ei ole
asn2ff: không tìm thấy lệnh
asn2ff: komanda nerasta
asn2ff: Kommando nicht gefunden.
asn2ff: kommandot finns inte
asn2ff: komut yok
asn2ff: nie znaleziono polecenia
asn2ff: níor aimsíodh an t-ordú
asn2ff: no se encontró la orden
asn2ff: no s'ha trobat l'ordre
asn2ff: opdracht niet gevonden
asn2ff: parancs nem található
asn2ff: perintah tidak ditemukan
asn2ff: príkaz nenájdený
asn2ff: příkaz nenalezen
asn2ff: команда не найдена
asn2ff: командата не е открита
asn2ff: 命令找不到
asn2ff: コマンドが見つかりません