So this was my first time doing a dual boot in my computer and i successfully did install ubuntu. However, in ubuntu i curiously downloaded lubuntu (since someone said that it was faster since lubuntu was feeling a bit slow) and unfortunately, I liked the layout of ubuntu at the end and got used to it. However, after rebooting it doesn't even let me choose the option of whether to start as ubuntu or lubuntu and it automatically starts as lubuntu which i hate T_T

I didn't put a login screen since it's my own computer and would like to know if there's a way to change back to ubuntu. Please! if you could explain step by step i'd be indefinitely graceful since I'm not a pro programmer or pro at ubuntu yet!

Thank you!

You can change the default session. The way to do this is explained in the Ubuntu Wiki here.

Alternatively, you can change the behaviour to allow a manual login. Then change the session from the login screen.