Wifi not working And freezing when turning it off

So sometimes when i am in my Browser after like 15 Minutes it just says i don't have an internet connection but My Taskbar says otherwise so i try to turn it off and on again but then it jst freezes and i neerd to restart

Mid - 2011 Macmini intel i5 4GB DDR3 SO-Dimm RAM

You need to install the B43 drivers for wifi.

sudo apt-get install firmware-b43-installer
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As well as the b43 fwcutter package to extract the firmware..

i get this error :

timmy@Macmini:~$ sudo apt-get install firmware-b43-installer
[sudo] Passwort fĂĽr timmy:              
E: Sperre /var/lib/dpkg/lock-frontend konnte nicht erlangt werden. Sie wird von Prozess 4122 (packagekitd) gehalten.
N: Beachten Sie, dass das Entfernen der Sperrdatei keine Lösung ist und Ihr System beschädigen kann.
E: Erlangen der Sperre für die Dpkg-Oberfläche (/var/lib/dpkg/lock-frontend) nicht möglich; wird sie von einem anderen Prozess verwendet?

This means that you are running more then one Package Management Process. You can only ever have one open lock at a time.
Please close down Synaptic or Software when running install or removal commands in terminal.

ooh ok

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