picard: 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/picard - from package: picard

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

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