[ubuntu] Help restoring the partition table

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http://ubuntuforums.org – Hi, I have a Dell Inspiron 17R laptop and I had some hardware issues (the SD-card reader didn't work and the keyboard kept losing keys). I sent it to Dell for repair, and they replaced the keyboard and the motherboard really fast. But, for no reason, they did a "system reinstall". I wonder if they do it to discourage my sending them the PC again. Anyway, this means I lost the whole Windows setup (no big deal, I hardly ever use it), and all the Ubuntu partitions, which is where I have most of my work. I have backups, but I'd like to recover the whole setup without reformatti (Hardware)