I have:-
- Intel core2duo E7500 2.93GHz dual core processor
- 2 Gb DDR2 ram
- Intel 945G graphics. (No graphics card)
- Ubuntu 16.04 LTS 64 bit working fine. Should I upgrade to 18.04?
I have:-
Your hardware is getting a little long in the tooth -- <3 GHz, 2 GB RAM, and Intel graphics is barely capable of running one of the lightweight versions of Ubuntu, like Budgie, Mate, or Xubuntu. I'd recommend trying one of those flavors on a Live Session with some of the applications you usually use (you can often browse to them on your existing install and run them from your hard disk while booted from a USB drive).
If the overall performance is acceptable, it should be slightly better from an installed copy -- your hard disk is usually going to be faster than a USB drive on an older machine like that.
Options that might help out, and are cheaper than a whole new system (assuming this is a desktop machine with socketed CPU): A Core2Quad processor with higher clock speed will significantly improve performance, and replacing your RAM (probably 2x 1GB modules) with 2x 2GB or 2x 4GB (the latter may be outside your motherboard's supported total, however) will make a big difference in the way your computer runs.
Bionic Beaver (18.04 64-bit) 2 GHz dual core processor or better 4 GB system memory (since 18.04.2) – colindaven Dec 26 '20 at 20:39