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That should be supported in Mint 19 using the r8188eu kernel module. Is something wrong with the internal wifi?

Is something wrong with the internal wifi?

Find a different source on github, something updated in the past year should work

I think I am using https://github.com/zebulon2/rtl8814au.git

I wonder

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cd /usr/src/backport-iwlwifi
sudo dkms add .
sudo dkms install backport-iwlwifi/git

What directory is the backport-iwlwifi folder in?

Ok, boot into the old kernel try

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sudo dkms add ./backport-iwlwifi
sudo dkms install backport-iwlwifi/git

I see this wlp6s0 IEEE 802.11 ESSID:"KCRSC" Mode:Managed Frequency:5.24 GHz Access Point: F8:A0:97:B1:EB:42 Bit Rate=866.7 Mb/s Tx-Power=22 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=51/70 Signal level=-59 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid...

Why do you need drivers? You seem to have a working Intel 8260 wifi

See https://askubuntu.com/a/1170858/300665
That fixes it with intel backports and dkms

The reason for the problem is wifi power management

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sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/*

Then reboot

sudo apt-get install dkms git build-essential git clone -b extended https://github.com/lwfinger/rtlwifi_new.git sudo dkms add ./rtlwifi_new sudo dkms install rtlwifi-new/0.6 sudo cp -r rtlwifi_new/firmware/rtlwifi/ /lib/firmware/rtlwifi/ echo "options rtl8723de ant_sel=2" | sudo tee /etc/modprobe.d...

Try

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sudo apt update

Then try your install command

Ignore driver manager, post results from terminal for

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 rfkill list; iwconfig

The working github would be https://github.com/cilynx/rtl88x2BU_WiF ... 80427-5959

Do in terminal

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sudo apt install build-essential dkms

Then go into that RTL88x2BU_WiFi_linux folder in the included driver and look at the readme.txt file and see if it has good instructions
Most times Linux drivers that are included don't support the newer kernels

If the switch doesn't work, you will have to disassemble the laptop and remove the internal wifi for the USB wifi to work

Is there a switch that enables/disables wifi?

It must have been longer than a few months ago as Mint 17 editions went EOL about April, update servers are likely all shut down

Strange that I have used the same chipset for 4 years and never encountered this issue that seems to be caused by short or zero length packets as this is reported to be the fix https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/net/wireless/ath/ath9k/recv.c?id=3c0efb7...

Now do sudo apt-get install dkms git build-essential git clone -b extended https://github.com/lwfinger/rtlwifi_new.git sudo dkms add ./rtlwifi_new sudo dkms install rtlwifi-new/0.6 sudo cp -r rtlwifi_new/firmware/rtlwifi/ /lib/firmware/rtlwifi/ echo "options rtl8723de ant_sel=2" | sudo tee /etc/modp...

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