I will offer one more view, Solaris is quite different in every way and there is a learning curve, one alternative you may want to consider is one that I took. I moved to the root of why eveyone builds on Debian, amazing stability and the originator of the apt package management. It has a great selection of software over 28000 packages. It is a rolling release with great stability, so the advantage of LTS is also the same for this. It has all the desktop bells and whistles but I found it to be much more stable. The only thing I went outside to upgrade was the NVidia driver. They offer the proprietary but it is not as current as ubuntu/Mint Fedora etc. So I installed their version, their way. This did all the neccessary blacklisting then I installed the latest Nvidia from the NVidia site. This brought the graphics up to par. The community is the best I have seen, knowledgeable and willing to help. (Every post I put was answered even just to say they would check it out and if they found something let me know) , I had a lot of peculiar questions. I bounced around for years was on Mint then Ubuntu then I went to Debian the source of about half the distro's out there. Solaris is a hefty powerful beast but will take a commitment to learn and does not have the advantages you grew use to in Ubuntu, one poster mentioned Solaris 11, that would be a step in between, he is right and it is geared more for the modern user but does have the time into that genre that Debian/Ubuntu/Mint/Fedora have. For me it is Debian all the way, stability, speed and versatility, and it is on like almost every platform out there literally amd64, armel, hppa, kfreebsd,ia64,mips,mipsel,powerpc and sparc. Hope this helps( I sounded like a commercial but I can't help it, I bounced around for years.)

--jerry