Non pode descomprimir o ficheiro

que intenta descomprimir un ficheiro, así que estou probando o seguinte comando que me sinto moi novo en Linux

Por certo, esta é a versión máis recente do servidor Ubuntu.

user@serverubuntu:~/minecraft/server$ lsrtk.zipuser@serverubuntu:~/minecraft/server$ sudo unzip rtk.zipsudo: unzip: command not founduser@serverubuntu:~/minecraft/server$ 

cando intento sen sudo recibo isto

user@serverubuntu:~/minecraft/server$ unzip rtk.zipSorry, command-not-found has crashed! Please file a bug report at:https://bugs.launchpad.net/command-not-found/+filebugPlease include the following information with the report:command-not-found version: 0.3Python version: 3.2.3 final 0Distributor ID: UbuntuDescription: Ubuntu 12.10Release: 12.10Codename: quantalException information:unsupported locale settingTraceback (most recent call last): File "/usr/lib/python3/dist-packages/CommandNotFound/util.py", line 24, incrash_guard callback() File "/usr/lib/command-not-found", line 69, in main enable_i18n() File "/usr/lib/command-not-found", line 40, in enable_i18n locale.setlocale(locale.LC_ALL, '') File "/usr/lib/python3.2/locale.py", line 541, in setlocale return _setlocale(category, locale)locale.Error: unsupported locale setting

Grazas de antemán

Editar: o ficheiro zip que resultou ser corrupto.