For NetworkManager to manage your device, you'll need to remove the entries referring to eth0 in /etc/network/interfaces:
iface dsl-provider inet ppp pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf provider dsl-provider auto eth0 iface eth0 inet manual >From the initial opening of this bug report. Further issues from the syslog excerpt: Aug 4 18:57:05 melvin-desktop ntpdate[1861]: step time server 91.189.94.4 offset 0.548440 sec Aug 4 19:00:14 melvin-desktop pppd[1790]: No response to 3 echo-requests Indicate an issue with BSNL directly. NetworkManager has nothing to do with it. You should contact your ISP to investigate this matter, especially if it also happens with Windows. Marking as Invalid, since this does not appear to be a bug. ** Changed in: network-manager (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/811532 Title: DSL Dialer: Network applet shows 'device not managed' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/811532/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs