Have no idea what is wrong with rpcd, but I’ll try to help with other problems.
Check Your luci config:
/etc/config/luci
config core ‘main’
option mediaurlbase ‘/luci-static/bootstrap’
option resourcebase ‘/luci-static/resources’
option lang ‘pl’
config extern ‘flash_keep’
option uci ‘/etc/config/’
option dropbear ‘/etc/dropbear/’
option openvpn ‘/etc/openvpn/’
option passwd ‘/etc/passwd’
option opkg ‘/etc/opkg.conf’
option firewall ‘/etc/firewall.user’
option uploads ‘/lib/uci/upload/’
config internal ‘languages’
option en ‘English’
option pl ‘Polski (Polish)’
config internal ‘sauth’
option sessionpath ‘/tmp/luci-sessions’
option sessiontime ‘3600’
config internal ‘ccache’
option enable ‘1’
config internal ‘themes’
option Bootstrap ‘/luci-static/bootstrap’
config internal ‘apply’
option rollback ‘30’
option holdoff ‘4’
option timeout ‘5’
option display ‘1.5’
config internal ‘diag’
option dns ‘www.turris.cz’
option ping ‘www.turris.cz’
option route ‘www.turris.cz’
Also LXC config should be converted to new LXC version
Adjust bold sections to Your needs.
/srv/lxc/Debian/config
lxc.arch = armv7l
lxc.tty.max = 4
lxc.pty.max = 1024
lxc.include = /usr/share/lxc/config/common.conf
lxc.hook.start-host = /usr/share/lxc/hooks/systemd-workaround
lxc.rootfs.path = btrfs:/srv/lxc/Debian/rootfs
lxc.uts.name = Debian
lxc.net.0.type = veth
lxc.net.0.link = br-lan
lxc.net.0.flags = up
lxc.net.0.name = eth0
lxc.net.0.ipv4.address = 192.168.9.3/24
lxc.net.0.ipv4.gateway = 192.168.9.1
lxc.net.0.hwaddr = xx:xx:xx:xx:xx:xx
Also, take a look at this post: