Most efficient OS X for MacBook Air 2,1

I have an old MacBook Air 2,1 (2 GB RAM, 120 GB SSD, 1.8 gHz Core 2 Duo) that runs dead-dog slow and fan perpetually running with Yosemite, so I am going to wipe the drive, partition it in two, install Ubuntu on one partition and OS X on the other. My inclination is to install Snow Leopard as it seems this is the consensus for OS X efficiency on this model. So, opinions on other OS X versions for this particular MBA?

TIA!

 

OK, I installed SL and the computer runs quietly. The only issue I've found so far is that when I launch iTunes (most current version) I get an error message about some "Tea" plugin that can't be used. I have no idea where this plugin is so I can't get rid of it. It's not in ~/Library/Audio/Plug-ins. It must have come over when I did Migration Assistant from my MacBook. It sure is annoying.

However, Ubuntu was a pain in the backside to get installed (16.04). After installing the rEFind boot loader my 8 GB USB thumb drive simply wouldn't boot. I created one multiple times using unetbootin but each time it failed. I have no idea what I did differently to finally get it to boot; the thumb drive is initialized as FAT32 and GUID partition table. Anyway, I had to boot using the "Try Ubuntu without Installing" option (probably should have done this sooner) because booting from the "Install Ubuntu" failed with a boot error. Once booted into the "Try" option I was able to do the installation on the remaining 40 GB partition of my SSD. The track pad was sluggish and the pointer jumped all over the place (but works fine after the installation) so it was a bit challenging to get all the options. After reboot from install, there was no wifi and I had to find how to manually install the drivers (they were on the USB drive but not automatically installed). For those who may encounter this problem in the future, here's what I did:

Plug in the installer thumb drive. Two files needed located on the USB thumb drive:

pool/main/d/dkms/dkms_2.2.0.3-1.1ubuntu5_all.deb
pool/restricted/b/bcmwl/bcmwl-kernel-source_6.30.223.141+bdcom-0ubuntu2_amd64.deb

I copied these files to the root of the thumb drive and opened them in a window. I then opened terminal and typed this command:

sudo dpkg -i (dragged the bcmwl* file here) <ENTER>
sudo dpkg -i (dragged the dkms* file here) <ENTER>

And that was it; wifi worked great after that. There was an update to Ubuntu and after it installed I tried to reboot but the computer wouldn't shut down, so I had to do a hard shut off. After rebooting, the computer shuts down/restarts just fine. So, all seems good now.

 

First popup is:

An unknown error occurred (-50).

Second popup is:

“iTea” could not load in 64-bit mode.
Try contacting the plug-in vendor(s) to see if a 64-bit version is available.

I don't know if they're the same error, or two separate errors.

 

Well, thanks much. That is progress. Nothing in my home folder, but changing to my hard drive's root and using sudo to launch, I get this:

WhiteArrowCursor.tif
markWorldWriteable
iTea
iTea_SDK_5.rtf
AccessibilityDarkGraphiteAppearance.car
AccessibilityGraphiteAppearance.car
GraphiteAppearance.car
WriteAdapter
./System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/share/ri/2.0.0/system/Net/InternetMessageIO/WriteAdapter:cdesc-WriteAdapter.ri
ls: 3: Not a directory
ls: 4: directory causes a cycle

So, where is iTea??? Can I use terminal to list complete paths?

--- Post Merged, Feb 26, 2017 ---

Ha! I found the iTea issue. It was hidden in a bundle in the /Library/iTunes/Plug-ins folder. So, that problem is gone. However, I still have the error -50 problem. I suspect that's an iTunes issue trying to connect to the iTunes store (I don't use this computer for connecting to iTunes).

 

Will keep that in mind. Thanks very much for your help. I'm pretty sure the -50 error is an authentication error with the iTunes Store. I can live with it for now.