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I am thinking of buying Dell Inspiron 15, 3000 series that comes with Ubuntu 14.04 LTS pre-installed (http://www.dell.com/uk/p/inspiron-15-3552-laptop-ubuntu/pd) I have been searching everywhere about the experiences of upgrading from Ubuntu 14.04 to 16.04 on this machine, and so far it seems like the upgrade fails quite badly for most cases, with some others having problems with hardwares. But these search results dated at least 3 to 6 months back.
So I am wondering if there has been anyone who has succeeded with the upgrade with all the hardware working in order? How about other distributions such as Debian or Linux Mint? I would really love to have this computer but it would be a waste if 14.04LTS is the only OS that works, even if its support cycle ends in 2019. I will also be happy if someone knows of a link where people post their successful upgrades.