I have a Dell Latitude 7400 with an integrated Intel UHD 620 Graphics and a dual-boot Windows 10 and Ubuntu 18.04.4 LTS. When just running Ubuntu live from my flash drive, my second screen is regularly detected. Though, when using the installed version, the second screen is not detected (while in Windows it clearly is). Unfortunately, most solutions that I find online use Nvidia drivers, which I cannot use. Do you know what I can try? Please let me know which kind of information I should provide you with to try to figure out the issue. Thank you.
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I solved it! Well, I did not do much myself. I installed Ubuntu version 20.04 LTS (which was released just a month ago), opting for a normal installation (as opposed to minimal installation) and toggling both other options (Download updates and Install third-party software). I don't know which part fixed it, but the second screen is now regularly detected.