trna2tbl: 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/trna2tbl - from package: ncbi-tools-bin

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

Error in other languages:
trna2tbl: bevel nie gevind nie
trna2tbl: comandă negăsită
trna2tbl: comando não encontrado
trna2tbl: commande introuvable
trna2tbl: command not found
trna2tbl: käsku ei ole
trna2tbl: không tìm thấy lệnh
trna2tbl: komanda nerasta
trna2tbl: Kommando nicht gefunden.
trna2tbl: kommandot finns inte
trna2tbl: komut yok
trna2tbl: nie znaleziono polecenia
trna2tbl: níor aimsíodh an t-ordú
trna2tbl: no se encontró la orden
trna2tbl: no s'ha trobat l'ordre
trna2tbl: opdracht niet gevonden
trna2tbl: parancs nem található
trna2tbl: perintah tidak ditemukan
trna2tbl: príkaz nenájdený
trna2tbl: příkaz nenalezen
trna2tbl: команда не найдена
trna2tbl: командата не е открита
trna2tbl: 命令找不到
trna2tbl: コマンドが見つかりません