On Wed, 2019-01-02 at 10:32 -0500, Ted To wrote:
> My experience was that a reboot allowed qcontrol to be installed but it 
> certainly makes sense that reloading devices could fix the install as 
> well.  I'm willing to help test this -- would I install the stretch 
> qcontrol (not backported), reboot and then try to install the backported 
> qcontrol?

I think so, yes. After installing the stretch qcontrol and rebooting
you should run:

    udevadm info -q all /dev/input/by-path/platform-gpio_keys-event

And confirm that it does _not_ have a line like:

    E: TAGS=:power-switch:systemd:

specifically either there should be no TAGS line or if there is one it
should not have "systemd" in it. I think that correctly replicates the
state before the failing update.

I guess you've have seen it while I was writing this mail, but note my
follow up where I decided that the correct command was:

    udevadm trigger -s platform -y gpio_keys && dpkg --configure -a

Thanks!

Ian.

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