This is working for me, thanks @janskyj
(U need “apt-get download dhcpcd5” on your turris terminal screen, then move downloaded *.deb package to your lxc container root folder, then log in lxc container and run apt-get remove isc-dhcp-client -y && dpkg -i dhcpcd5.deb in folder where you put deb file and reboot and it should work instantly. )
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