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I am new to Ubuntu and Linux. I replaced Windows with Ubuntu 18.04 on my HP laptop, with WiFi chip RTL8723DE.

I have already fixed a problem with an error saying "WiFi adapter not found". I followed this answer and this answer to solve that problem.

Now I can interact with WiFi, but after rebooting the PC, even though I can scan and see WiFi networks, when I try to connect, I get the error: activation of network connection failed

I am a novice using Ubuntu/Linux and I don't have Windows anymore. Please help me find a solution or help direct me to resources. I don't know where to start searching.

TheUser
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    the correct answer for new kernel is https://askubuntu.com/a/1250296/167850. But you need to remove all you installed before. – Pilot6 Jun 19 '20 at 19:58
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    @Pilot6 yes I tried that also there are 2 problems: first I don't know how to uninstall old drivers(coming from windows I never worked this low-level with the machine before) and second I tried that answer also but I get error in the terminal when I make install command, thanks for your reply hope you could guide me – TheUser Jun 19 '20 at 20:00
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    There is a folder called modprobe.d in /etc I understand that it contains configuration information about network devices, and I don't know if I also messed it up from some command in the terminal – TheUser Jun 19 '20 at 20:03
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    It is too hard to fix all you could mess up. – Pilot6 Jun 19 '20 at 20:04
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    So there is no solution? :( – TheUser Jun 19 '20 at 20:05
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    There is always a solution to do a fresh install and install drivers correctly. Also there is a solution to analyze what you really did and revert it. This needs some time and effort. – Pilot6 Jun 19 '20 at 20:11
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    @Pilot6 magically your answer here https://askubuntu.com/a/1250296/1096951 solved the problem, I don't know or care why it didn't work before but now it worked, and I hope it doesn't break after a while like other answers did, thanks alot – TheUser Jun 19 '20 at 20:33

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