>> Как интернет получаете - через прокси или обычный NAT? Покажите вывод env
>> в терминале.berez@219k4:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
berez@219k4:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp6s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether b8:70:f4:b4:d0:a4 brd ff:ff:ff:ff:ff:ff
inet 192.168.12.60/24 brd 192.168.12.255 scope global enp6s0
valid_lft forever preferred_lft forever
inet6 fe80::ba70:f4ff:feb4:d0a4/64 scope link
valid_lft forever preferred_lft forever
3: wlp7s0b1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 38:59:f9:84:71:d3 brd ff:ff:ff:ff:ff:ff
berez@219k4:~$