cleanasn: 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

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/cleanasn - from package: ncbi-tools-bin

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