Comment 91 for bug 1788997

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Kai-Heng Feng (kaihengfeng) wrote :

On my system:
$ rmadison linux | grep bionic-proposed
 linux | 4.15.0-48.51 | bionic-proposed | source

$ apt show linux-generic
Package: linux-generic
Version: 4.15.0.48.50

So I think -proposed is not correctly enabled in /etc/apt/source.list.d. This can be a bug in the updater GUI.