For some reason was the file /etc/network/interfaces changed to:
-----
auto lo
iface lo inet loopback
#auto eth0
#iface eth0 inet dhcp
#auto eth1
#iface eth1 inet dhcp
#auto eth2
#iface eth2 inet dhcp
#auto ath0
#iface ath0 inet dhcp
#auto wlan0
#iface wlan0 inet dhcp
mapping hotplug
script grep
map usb0
auto usb0
iface usb0 inet static
address 192.168.2.14
netmask 255.255.255.0
network 192.168.2.0
broadcast 192.168.2.255
up iptables -t nat -A POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE
up echo 1 > /proc/sys/net/ipv4/ip_forward
down iptables -t nat -D POSTROUTING -o eth0 -s 192.168.2.15 -j MASQUERADE
down echo 0 > /proc/sys/net/ipv4/ip_forward
----
After fixing it, the network started to work properly:
----
auto lo
iface lo inet loopback
#auto eth0
#iface eth0 inet dhcp
#auto eth1
#iface eth1 inet dhcp
#auto eth2
#iface eth2 inet dhcp
#auto ath0
#iface ath0 inet dhcp
#auto wlan0
#iface wlan0 inet dhcp
----
** Summary changed:
- Karmic: Network Manager doesn't set up resolv.conf, strange names of network
interfaces
+ /etc/network/interfaces corrupted during upgrade -> Network Manager can't
establich connection, strange names of network interfaces
** Changed in: network-manager (Ubuntu)
Assignee: (unassigned) => Matej Kenda (matejken)
** Changed in: network-manager (Ubuntu)
Status: New => Invalid
--
/etc/network/interfaces corrupted during upgrade -> Network Manager can't
establich connection, strange names of network interfaces
https://bugs.launchpad.net/bugs/435041
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