unpack200: 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/lib/debug/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/unpack200 - from package: openjdk-7-dbg
/usr/lib/jvm/java-7-openjdk-amd64/bin/unpack200 - from package: openjdk-7-jre-headless
/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/unpack200 - from package: openjdk-7-jre-headless

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

Error in other languages:
unpack200: bevel nie gevind nie
unpack200: comandă negăsită
unpack200: comando não encontrado
unpack200: commande introuvable
unpack200: command not found
unpack200: käsku ei ole
unpack200: không tìm thấy lệnh
unpack200: komanda nerasta
unpack200: Kommando nicht gefunden.
unpack200: kommandot finns inte
unpack200: komut yok
unpack200: nie znaleziono polecenia
unpack200: níor aimsíodh an t-ordú
unpack200: no se encontró la orden
unpack200: no s'ha trobat l'ordre
unpack200: opdracht niet gevonden
unpack200: parancs nem található
unpack200: perintah tidak ditemukan
unpack200: príkaz nenájdený
unpack200: příkaz nenalezen
unpack200: команда не найдена
unpack200: командата не е открита
unpack200: 命令找不到
unpack200: コマンドが見つかりません