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I did my test with my other laptop and Mint and it worked fine after installing rtlwifi-new, rebooting and changing the ant_sel to 2. I can't speculate as to what caused the issues you are having with it

Post results from terminal for

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rfkill list; lspci -nnk |grep -iA2 net

Copied wrong command, do this

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echo "options rtl8723be ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723be-ant.conf

You have it set correctly now, we could check where the parameters are set grep [[:alnum:]] /etc/modprobe.d/* | grep rtl8723be It returns no OUTPUT. So no output, then run echo "options rtl8723de ant_sel=2" | sudo tee /etc/modprobe.d/rtl8723de-ant.conf I don't know when this will be fixed, the bug ...

You have it set correctly now, we could check where the parameters are set

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grep [[:alnum:]] /etc/modprobe.d/* | grep rtl8723be

You might have the ant_sel already set check

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grep [[:alnum:]] /sys/module/rtl8723be/parameters/*

I have that wifi card in another laptop, I might have to put my hard drive from my Mint laptop in it and do some testing with one antenna wire connected

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Those commands would have to be run in -34 with Secure Boot disabled in BIOS/UEFI

Try

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cd rtlwifi_new
make clean
make
sudo make install

Then reboot

Post results for

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dkms status; uname -r

My nephew installed Mint 19 on his Lenovo laptop and we are having the same issue. There is only that mobile network and actually I am wondering if that is because bluetooth is enabled and he paired it with his phone - or tired to - to get internet. We went through and installed the Broadcom driver...

Try in terminal

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sudo apt update && sudo apt install firmware-b43-installer

Then reboot, see if it works

No magic, but post results from terminal for

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lspci -nnk | grep -iA3 net

And I might have some ideas

I wonder if you don't already have a parameter set

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grep [[:alnum:]] /etc/modprobe.d/* | grep rtl8723be

I would use the grub menu at boot advanced options menu to boot into a kernel older than 4.15.0-33 for now

But as long as the one in rfkill list results show hard block: yes, the USB will not work

This is strange, do

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cd rtlwifi_new
git status

What does it show?

See the wireless script link in my signature and post results

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dmesg | grep rtl8723be

Strange as that works in Ubuntu with the same kernel

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