Today, my friend Harpreet installed a new desktop environment (Lubuntu) and he found that after the installation new desktop environment some Lubuntu desktop packages conflict with each Unity packages and he couldn’t login from GUI. When he typed the password from GUI then computer asked again for typing the password (like a loop). Then he discussed his problem with me. I know it was the login loop problem (i.e. Ubuntu gets stuck in a login loop). But first, I fixed conflict packages problem and then I fixed login loop problem.
Here is the detail description that how to fixed the above problem.
When I solved the Harpreet’s problem I learnt many new things. Thanks Harpreet for gave me the opportunity to learnt something new.