By accident I've removed some folders (they were empty) in my home folder. I've created a new ones but they doesn't have proper icons etc... how can I recreate them step by step?
OK, to restore deleted directories
it should look like this:
If that fails, install and run Ubuntu Tweak
First, stop using your system from the hard drive ASAP. You will need to boot a live CD and try recovery from there.
I have had mixed, generally poor results with the ext4 file system, but try , in order, testdisk and then photorec. Both are in the repositories and both can be installed in the live session
You then run testdisk from the command line
There is a step-by-step tutorial , with screen shots, here
If that fails, try photorec.
Photorec is a part of the testdisk package, again there is a detailed walk through here
If that fails, you can try extundelete
Last time I tried that, it did not recover my files.