meshlabserver: 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/meshlabserver - from package: meshlab

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

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