Can't upgrade LyX on Focal Fossa

Jean-Marc Lasgouttes lasgouttes at
Mon Jul 20 14:31:15 UTC 2020

Le 20/07/2020 à 06:30, Liviu Andronic a écrit :
> On 7/13/20, Scott Kostyshak <skostysh at> wrote:
>> The following packages have unmet dependencies:
>>   sbuild-build-depends-lyx-dummy : Depends: libboost-signals-dev but it is
>> not installable or
>>                                             libboost-signals1.67-dev but it
>> is not going to be installed
>> Liviu, do you know how to solve this for the PPA?
> I did notice this issue with the build, but wasn't sure how to
> approach it. It's not exactly clear to me why Ubuntu Focal would have
> difficulties installing 'libboost-signals1.67-dev' on a fresh image. I
> would need to test a few things just to understand why this is
> happening.

I see this in boost 1/69 release notes:
Signals (v1) is now removed. Its removal was announced in 1.68 and its 
deprecation was announced in 1.54. Boost 1.68 is the last release that 
provides this library. Users are encouraged to use Signals2 instead. The 
Boost community thanks Douglas Gregor for his work on Signals which 
served its users well and which also inspired Signals2.

Actually, we have switched to Boost.Signals2 some time ago (in 2.3 
already), so that we do not need boost-signals-dev anymore. I would try 
with libboost-dev only as dependency.


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