Comment 4 for bug 1767761

Hi Gustavo, thanks for following up. If you are affected by https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1734147 please look at the information there about using a custom kernel to recover your firmware's writable state.

For the record, you mention having problems after installing Ubuntu 17.04, but this bug only affected systems which were running Ubuntu 17.10. But the symptoms you're describing certainly sound like this bug, so I would guess that you just have mentioned the wrong version number.