It is no secret that with the release of Ubuntu 9.10, there was a problem of accessing the Internet through the Network Manager, through the created DSL connection.
You can of course score on this bug and use pppoeconf, but I dripped on.
So, after intensive searches, trial and error, it was discovered that for NetworkManager to work properly in Karmic Koala (creating and connecting a DSL connection through it), it is necessary to update it (to date, to version 0.8 *).
All this is done very simply:
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1. We still need an Internet connection, so for now let's use pppoeconf:
sudo pppoeconf
2. Add lines to /etc/apt/sources.list
deb ppa.launchpad.net/network-manager/trunk/ubuntu karmic main
deb-src ppa.launchpad.net/network-manager/trunk/ubuntu karmic main
3. Import the key and update the package list
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BC8EBFE8
sudo apt-get update
4. Update NetworkManager
sudo apt-get install network-manager
5. Remove the extra lines from / etc / network / interfaces, namely, leave only
auto lo
iface lo inet loopback
6. Restart the system, add a new DSL connection (I’ve checked the auto-connect checkbox at the start) and enjoy (-: