HP Scanjet 7400c Scanner locks USB2 port

Wolf, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1643544

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

Followed the instructions given above. (:

Wolf:

>"Followed the instructions given above. (:"

So, what happened specifically? The expected files weren't attached.

Despite this, it may be helpful to perform the apport-collect via a live environment using http://cdimage.ubuntu.com/daily-live/current/ .

Could you please advise?

Thanks for your attention.

I did a SSO login and opened this issue web page (1643544).
Then did the command:

apport-collect 1643544
Package sane-backends not installed and no hook available, ignoring
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

A window pops up "no further information gathered" (see attachment)

$ sudo apt-get install sane-backends
says that the package cannot be found. I cannot find it in synaptic either. And this page (https://launchpad.net/ubuntu/+source/sane-backends/1.0.25+git20150528-1ubuntu2) says, that it's for USB3 "or fast recent hardware" - which is not available at my system.

So - what can I do now.

Wolf, could you please test for this issue via http://cdimage.ubuntu.com/daily-live/current/ ? Please retry the apport-collect in this environment and advise to the results.

The live system from "zesty" produced precisely the same results (see #5).

Wolf, the apport-collect not working must be due to a limitation of apport with sane-backends. sane-backends is a meta package that represents all the different packages it provides as per:
https://launchpad.net/ubuntu/+source/sane-backends

Hence, let this step be skipped.

Despite this, to further narrow this down, did this problem not occur in a Ubuntu release prior to 16.10?

Given this works in Debian 8.6, and prior versions of Ubuntu are similar to this, this is likely a regression in Ubuntu also.

I don't use the scanner daily, so I'm not completely certain. But as far as I remember, the problems started in ubuntu 16.04 with a kernel 4.4.x. At that time, I tried to go back to a prior kernel version, but that failed for nvidia video driver reasons.

There is quite a number of problem reports at the sane mailing list (<email address hidden>) - on the avision backend, and as well on USB problems with other backends.

Here is one recent example:
http://lists.alioth.debian.org/pipermail/sane-devel/2017-January/034968.html

Status changed to 'Confirmed' because the bug affects multiple users.