I'm having the same problem.
The amazing thing is that when I type in the terminal the following command:
(devhelp -s gtkmm) gtkmm documentation to open a window and works normally.
Not only her, but all documentation related to C ++.
The terminal displays several messages I'm still analyzing.

2016-10-27 5:02 GMT-03:00 Kjell Ahlstedt <kjell.ahlst...@bredband.net>:

> I met with the same problem after upgrading from Ubuntu 16.04 to Ubuntu 16.10 
> with glibmm-2.4 2.48.1 and gtkmm-3.0 3.20.1.
> Have you found a solution?
>
> /Kjell
>
> On 2016/09/19 12:10, D. B. wrote:
>
> I noticed this in Builder, but it applies equally to DevHelp in the main
> (which Builder just calls on).
>
> Both the gtkmm and glibmm documentation sets are shown as options in DevHelp,
> but they're unusable. DevHelp gives an "Error opening the requested link"
> on the 1st try to open any document in either tree, and is silent after
> that. Other docs work OK.
>
> /usr/share/devhelp/books contains directories for both projects with .devhelp2
> files therein, which seem to point at the correct paths (albeit via
> symlinks, but that makes no difference) - but neither are usable. I tried
> changing the path to avoid the symlink, and it made no difference. The
> files are present at the mentioned location and can be browsed using a
> normal web browser, just not DevHelp.
>
> Possibly relevant 
> links...https://bugs.launchpad.net/ubuntu/+source/gtkmm3.0/+bug/886705https://bugs.archlinux.org/task/8022
>
> Is this just for me? Any ideas on how to fix it, either way?
>
> Thanks
>
>
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>
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