I have done a silly things. Some days ago I install dolphin in my Ubuntu 12.04. After that I was in love with dolphin for having thumbnail preview of folder with images inside. So, I thought of setting dolphin as a default file manager. So from the following link I found a solution: How to run Dolphin instead of Nautilus?
I have not followed the whole artical. Just used the first code:
sudo mv /usr/bin/nautilus /usr/bin/natilus.back && sudo ln -s /usr/bin/dolphin /usr/bin/nautilus
It makes my default file manager as dolphin. When I click to home folder launcher it now opens with dolphin.
Now I want to revert to Nautilus. But I am not getting any way to go back. But I thought if I change the upper code it may revert. So, I changed it with:
sudo mv /usr/bin/nautilus /usr/bin/natilus.back && sudo ln -s /usr/bin/nautilus /usr/bin/dolphin
And after that nautilus is not working. If I click home folder it also not working. If I write gksu nautilus in terminal it also not working after giving password. The only way that is left to access file manager is using dolphin. So, please help me. I need a solution. I need to make everything like before.
Now when I try to access mounted drive from launcher. It says:
Failed to execute child process "/usr/share/applications/nautilus.desktop" (Permission denied).
Please help me as soon as possible.