It's not a bug. Read /usr/share/doc/network-manager/README.Debian, please.
To manager your network manually,
First to edit (as root) /etc/NetworkManager/nm-system-settings.conf:
[ifupdown] managed=true
then edit your /etc/network/interfaces and /etc/resolv.conf for your IP and name server.
then reboot.
Then will be OK.
It's not a bug. Read /usr/share/ doc/network- manager/ README. Debian, please.
To manager your network manually,
First to edit (as root) /etc/NetworkMan ager/nm- system- settings. conf:
[ifupdown]
managed=true
then edit your /etc/network/ interfaces and /etc/resolv.conf for your IP and name server.
then reboot.
Then will be OK.