[For completion's sake: 8.04 (Hardy Heron) is the roughly closest Ubuntu LTS to Windows 7, and hasn't been supported since 2013. 10.04 (Lucid Lynx) was the closest LTS to Windows 7 SP 1, and also hasn't been supported since 2013 (on Desktop).]
I used the more closely aligned dates because Windows and Ubuntu have been aligned to similar-ish 6 month cycles for a while now and especially in Windows 10. It's interesting that the LTS equivalents are in opposite parts of the cycle with Ubuntu LTS in the Spring and Windows LTS in the Fall. But even accounting for LTS versus LTS, the fact of the matter is that Windows extended security support still dwarfs the comparable Ubuntu timeframes and few are complaining that Ubuntu's support windows are too short. Of Desktop LTS support, Microsoft's seems almost by far the longest of any Desktop OS/distribution and no one is expecting Desktop support for even a Linux LTS distribution support like they expect from Windows.
Point being, even.04 Ubuntu releases vs Windows seem to be the better metric if we're talking about support. Anything outside of those (non-even.04 Ubuntu or Windows Insider releases) you get the benefit of being on the bleeding edge, but you're going to be poked more than usual.