Comment 56 for bug 855428

I am sorry, reading my comment above I realized that there were wrong references. I cannot edit the comment, so I copy and paste the post with the right references. I AM SORRY FOR THE MESS:

OK, this is what worked for me:

1) I have a second computer (Windows 7 Pro x64), which I usually don't use (it's my old laptop). I decided to see if there was a problem there. Nop, everthing was working fine (Ubuntu One 2.0.3). Then I tried the autoupgrade. Didn't work. I was so pissed off that I almost threw the computer away through the window.

2) I decided to take my time, a little bit of fresh air, went for a coffee, thought about how the day had started raining and now there was sunshine all over.

3) More than 15 minutes later, I came back to the OLD computer. I tried executing the autoupgrade running the application "as administrator". It worked! Now, my old computer had Ubuntu One 3.0.0 running with no problems. I tested it (create a new file in the Ubuntu One folder) and worked fine.

4) Playing with the tabs of the application in my old computer I ended up in my Ubuntu One webpage (in the browser). For my surprise, I found that there were 2 duplicated devices: my old computer (Asus G1) and my new computer (Asus N73). I figured out that it might be something wrong with that. I deleted the old entry for my old computer (left the new one, apparently, Ubuntu One 2.0.3 created one "device", and Ubuntu 3.0.0 created another "device" for the same computer). I also deleted both entries of my NEW computer.

5) Went back to my NEW computer and uninstalled Ubuntu One, deleted the "ubuntuone" folder in "Program Files (x86)", and also the Ubuntu One credential (go to Control Panel, search for Credentials, and look for the Ubuntu One credential and remove it. Basically, I uninstalled Ubuntu One and left no trace of it in my NEW computer (checked the Ubuntu One web feature and there were therefore only 2 devices, my OLD computer and my tablet).

6) Downloaded from scratch Ubuntu One 3.0.0 in my NEW computer and installed it running it "as Administrator". It asked me to sign up. It logged in and went to the "sync folders" step. It was taking a while again, but I simply click on "Next" and went to the next step, where I could find all my sync folders listed. I click finish and the Ubuntu One control panel appeared. No "get_rootdir" error. It quickly updated the files.

7) Et voilà, Ubuntu One 3.0.0 is working also in my NEW laptop.

I have no clue what of all I did was exactly what it made the thing work. Perhaps you may find an technical explanation. I hope this serves to someone else.