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    Missing drivers or firmware, probably because they are in the non-free section. Commented Jun 29, 2021 at 4:06
  • Even if you have a r8168 you probably should stick to default r8169 driver ( unix.stackexchange.com/questions/26997/… ). AND anyway install firmware-realtek Commented Jun 29, 2021 at 7:21
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    If Windows was hibernated it could have turn the card into the state when it is unusable in Debian. The solution could be to assure Windows was shut down, not hibernated. Also try to cut all power from the machine (leave only CMOS Li battery) to erase all temporary state. // All in all, I don't see a point in double booting. If you want Windows, use Windows. If you want Linux, use Linux. Just decide already and don't use both. Commented Jun 29, 2021 at 9:34
  • @Nikita Kipriyanov ,i am sure that it is un-related with windows. I installed a new debian10 with same version after the old debian10 can't recognize ethernet device ,now there are three oses in my pc instead of dual. Enter into the new installed debian , i can connect internet with pppoeconf!!!Both win10 and new installed debian10 can connect with internet!Why my old debian10 can't recognize ethernet device! Commented Jun 29, 2021 at 23:09