Ubuntu 12.04 cannot install applications
We need more details: which applications and versions? what have you tried to do? is this a fresh install or it stopped working? do you get any errors when you try to perform the install action?
From terminal try:
sudo apt-get update
sudo apt-get upgrade
and then retry to install.
cereal is precisely correct. If you know the package name, you can also type
apt-get install [package-name]
For example, if I want to install an nginx server on my ubuntu, I would type this on my terminal
// system will ask for password
// I must provide the password
sudo apt-get install nginx
Please ignore the [ and ] just type the package name of what you are trying install.
Also, if you don't know the package name, then use the following
apt-cache search [search term]