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Let me preface this by saving that I am not familiar with your specific model of laptop. So this is more an educated guess than certainty. That said, I don't see any reason why you can't, as long as it will physically fit and connect. The performance should be better (higher read/write speeds) with the hybrid drive.

It looks like this is an evolutionary release, and Canonical says they emphasized a reduced memory footprint and "significantly faster response times".  I don't think there are many UI changes.  

If you recall all the problems that Boeing has had with lithium ion batteries catching fire on the new Dreamliners, that may provide a clue to part of the reason. One of the places I order batteries from has an explanation on their website that pretty well sums it up:

You can actually get by pretty well if you live where there is good WiFi coverage. Once your contract is up you can use it as a WiFi only device.  You mentioned you have an Android, and I've used a spare Android phone without contract for a couple of years as spare phone. To be able to text, IM, voice call, etc.

Photoshop has the ability to add a watermark, but it's a bit of a pain. You have to create text as a separate layer, determine transparency/blending/etc. Then once you have it down, if you want to do it in the future or create a batch watermark, you have to go into file>automate>batch. It's not hard really, just a bit of a pain.

You have higher potential speeds, with 802.11n. 802.11g = up to 54Mbps, whereas 802.11n can only support up to 700Mbps. Keep in mind, those speeds are best case. The other main thing is that you are more likely to get a strong signal with "n" if it is operating in the 5Ghz radio spectrum.

Does anyone know how to reset Unity configuration to default values?

A lot of times you can avoid the need to actually sideload APKs through a USB connection or the SD card. First go into your SETTINGS > APPLICATIONS then check the box to allow UNKNOWN SOURCES to enable installation of apps that aren't from Google Play. The steps may vary a little depending on your version of Android.

How do I make sure SpamAssassin is running in Sendmail, and if it isn't how do I turn it on?

ISPs are voluntarily adopting a "six strikes" plan coordinated with the MPAA and RIAA so that any time an entertainment business issues a copyright complaint, unsubstantiated or not, users accounts will be sanctioned.

There are a lot out there.  You didn't mention how old the kids were; what would be fun for one age might well be frustrating for younger children.