Hi ve2ebp,
It is not convenient, but it is possible to recover erased files as long as 'only' the address is deleted and the data is still sitting on the hard drive. Search in the Ubuntu Forums for similar threads, and browse the internet to find out what can be done and which tools are available!
Do you still have copies of your files in the dropbox folder, or any other backup? If not you have to be very careful so that nothing will be written to your disk because it might overwrite your file data, that you want to retrieve.
I suggest that you use a rescue live system. There are many of them, browse the internet and select one. Make a boot CD, boot from it and do the work. But first,
read the relevant tutorials that you can find on the internet!
Photorec might be the tool for you.
Good luck
Olle
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