[ubuntu] Help need with installation!

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http://ubuntuforums.org – Hello guys. I am a newbie. I needed help with installation OS some programs. When i type in the codes of downloading a particular program in the terminal(Ubuntu 12.04.2 Precise pangolin) i get some error stating that "Could not get a lock on some var STUFF". After a reboot an error box popped up stating that it is impossible to install or remove any program and to fix it i needed to do some STUFF about "synaptic" and also a code to fix it was there in the error. I entered the code in the terminal but still an error stated that could not get a lock on var. I tried downloadi (Hardware)