usb0 disconnections on Ubuntu because of the NetworkManager

Hi, When I connect to my Jolla through ssh over USB from my Ubuntu, I often get disconnected : $ ifconfig usb0 | grep inet.addr $ $ route -n | grep usb0 $ EDIT : I've finally set `usb0` ip address manually : $ sudo ip address add 192.168.3.14/31 dev usb0 $ ifconfig usb0 | grep inet.addr inet addr:192.168.3.14 Bcast:192.168.3.255 Mask:255.255.255.254 $ ssh nemo@192.168.3.15 nemo@192.168.3.15's password: X11 forwarding request failed on channel 0 Last login: Tue Oct 29 01:05:35 2019 from 192.168.3.14 NOTICE: Env value ignored QT_GSTREAMER_CAMERABIN_FLAGS=15 NOTICE: Env value ignored QT_WAYLAND_RESIZE_AFTER_SWAP=1 ,--- | SailfishOS 1.0.4.20 (Ohijärvi) (armv7hl) '--- [nemo@localhost ~]$ Can anyone help me solve this problem ?