I have just bought a Lenovo IdeaPad L340 with Windows 10. I want to install Ubuntu 18.04 as a dual boot and no, the question is not about how to achieve that 
It’s about the partition size. So far there are 2:
Which one to shrink and with how much, so that both OS’s might run comfortably?
I’s also like to leve DATA for installation files, like games and such.
Thanks!

It’s about the partition size. So far there are 2:
- Windows (C:\), 199 GB, 136 free
- Data (D:\), 276 GB, 276 free
Which one to shrink and with how much, so that both OS’s might run comfortably?
I’s also like to leve DATA for installation files, like games and such.
Thanks!