Finally it works.
Thanks.
I specified IP staff manually in *nm-connection-editor* taking into account 
BBB IP:

[image: Screenshot from 2020-10-08 19-58-34.png]
Here is BBB *ifconfig*:
debian@beaglebone:~$ ifconfig
eth0: flags=-28605<UP,BROADCAST,RUNNING,MULTICAST,DYNAMIC>  mtu 1500
        inet *169.254.44.158*  netmask 255.255.0.0  broadcast 
169.254.255.255
        inet6 fe80::96e3:6dff:fed4:ae86  prefixlen 64  scopeid 0x20<link>
        ether 94:e3:6d:d4:ae:86  txqueuelen 1000  (Ethernet)
        RX packets 30  bytes 3658 (3.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 57  bytes 15434 (15.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 55  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 480  bytes 33280 (32.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 480  bytes 33280 (32.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

usb0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.7.2  netmask 255.255.255.0  broadcast 192.168.7.255
        ether 94:e3:6d:d4:ae:88  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

usb1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.6.2  netmask 255.255.255.0  broadcast 192.168.6.255
        ether 94:e3:6d:d4:ae:8c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

debian@beaglebone:

Then I pinged Ubuntu from BBB and it was Ok.
Then I tried ssh connection and it also worked.
What is strange: the wired connection doesn't appears in main Ubuntu 
settings:

[image: Screenshot from 2020-10-08 20-04-56.png]


Before I encountered these connection issues, I could see a wired 
connection in the networks settings (screenshot above).

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