convert2blastmask: 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/convert2blastmask - from package: ncbi-blast+

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

Error in other languages:
convert2blastmask: bevel nie gevind nie
convert2blastmask: comandă negăsită
convert2blastmask: comando não encontrado
convert2blastmask: commande introuvable
convert2blastmask: command not found
convert2blastmask: käsku ei ole
convert2blastmask: không tìm thấy lệnh
convert2blastmask: komanda nerasta
convert2blastmask: Kommando nicht gefunden.
convert2blastmask: kommandot finns inte
convert2blastmask: komut yok
convert2blastmask: nie znaleziono polecenia
convert2blastmask: níor aimsíodh an t-ordú
convert2blastmask: no se encontró la orden
convert2blastmask: no s'ha trobat l'ordre
convert2blastmask: opdracht niet gevonden
convert2blastmask: parancs nem található
convert2blastmask: perintah tidak ditemukan
convert2blastmask: príkaz nenájdený
convert2blastmask: příkaz nenalezen
convert2blastmask: команда не найдена
convert2blastmask: командата не е открита
convert2blastmask: 命令找不到
convert2blastmask: コマンドが見つかりません