First purchase

[tophneal]

The above-mentioned problems are not an obstacle for me.
I need Linux mainly for bash (I'm starting my adventure with competitive programming).
I managed to test Ubuntu with a friend and I am very satisfied with it.
Laptop will not be my main work tool (I have a desktop at home), instead I'd like to get to know Linux - its pros and cons and maybe switch to it over time.

I have one more question, how long does the laptop keep on the battery and what are the chances of having problems with ubuntu?
(https://ubuntu.com/download/desktop)

Battery life will depend heavily on usage (ie compiling.) average computer usage, you can easily get 8-10 hours of life from the battery. Putting it under consistent, heavy load will half that. If you expect to have it under a heavy load, carry your charger with you and you should be fine.

(Side note of warning here: when the battery is fully depleted, it can take up to 24h to get back to a bootable state and still may require further charging.)
The most recent 20.04 Ubuntu img seems to be running fine for most people and most of the quirks of the install seem to be addressed, or are easily addressed by the user. If you look in the PBP Tutorials forum, you should see a post concerning it.