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I have recently installed Ubuntu 16.04 .and my networking settings are Proxy oriented. I added IPv4 settings and saved them but when I see the added IPv4 settings again, the subnetmask settings are not saved as I entered. In the place of subnetmask (255.255.252.0) a default number 22 is saved as show in the image below.

enter image description here

I don't know why that number has been appearing again and again even after saving required IPv4 settings.

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    Please edit your question to include the IP address and gateway that you are trying to set - the problem may be that the mask is not compatible with other settings.
    – steeldriver
    May 18, 2016 at 13:39

1 Answer 1

Reset to default
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It's not error, 255.255.252.0/22 it's a representation.

Restart your network manager for network problem

Press Ctrl + Alt + T (open terminal) and type:

sudo service network-manager restart
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