LINUX MINT TROUBLE WIFI MERK HP

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Well, I solved my problem, with some help elsewhere. Just for the record, the network card of this HP model seems to have just one antenna (instead of two). So, the driver had it wrong, what antenna is connected and where.

Solution: with the driver already installed try:

sudo modprobe -r rtl8723be
sudo modprobe -v rtl8723be ant_sel=1

and 
sudo modprobe -r rtl8723be
sudo modprobe -v rtl8723be ant_sel=2

and see which of the two will get you a strong wifi signal.

Then edit the option in /etc/modprobe.d/rtl8723be.conf with a command like this one:
echo "options rtl8723be ant_sel=1" | sudo tee /etc/modprobe.d/rtl8723be.conf