Please see if you remove the line "no-auto-default=00:27:0e:1c:f4:ab," from /etc/NetworkManager/nm-system-settings.conf if the situation improves.
If you use NetworkManager only to manage your network connections, you should also be able to safely remove all entries for eth0 from /etc/network/interfaces:
# The primary network interface
auto eth0
#iface eth0 inet dhcp
Please see if you remove the line "no-auto- default= 00:27:0e: 1c:f4:ab, " from /etc/NetworkMan ager/nm- system- settings. conf if the situation improves.
If you use NetworkManager only to manage your network connections, you should also be able to safely remove all entries for eth0 from /etc/network/ interfaces:
# The primary network interface
auto eth0
#iface eth0 inet dhcp
Thanks!