*** This bug is a duplicate of bug 284298 ***
https://bugs.launchpad.net/bugs/284298
I had the same problem.
The procedures are:
Edit (as root) /etc/NetworkManager/nm-system-settings.conf:
1) Locate the lines
[ifupdown]
managed=false
2) And change the value for the attribute managed for true
[ifupdown]
managed=true
No problems for me now :)
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wired connection settings are lost after reboot
https://bugs.launchpad.net/bugs/259214
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