[Debian-science-sagemath] apt upgrading issue:

[Tobias Hansen]

On 08/11/2016 11:51 AM, Jerome BENOIT wrote:
> Hi,
> 
> On 11/08/16 10:51, Ximin Luo wrote:
>> Jerome BENOIT:
>>>  sagemath-build-deps : Depends: libbrial-dev (>= 0.8.5) but it is not going to be installed
>>>                        Depends: libbrial-groebner-dev (>= 0.8.5) but it is not going to be installed
>>>                        Depends: python-brial (>= 0.8.5) but it is not going to be installed
>>>
> 
>> What's the rest of the error message? When it says "it is not going to be installed", there should be other reasons on why, above this.
> 
> Indeed, but I could not figure it out. Hence my email.
> 
> 
>> You could also try using `aptitude install -R sagemath-build-deps` instead of apt-get, it has a more sophisticated dependency resolution.
> 
> Finally I get a hint from dselect:
> 
> 	libbrial-groebner-dev depends on libbrial-groebner0 (= 0.8.5-0+sage1)
> 	libbrial-groebner0 depends on libpng12-0 (>= 1.2.13-4)
> 	libpng12-0 does not appear to be available
> 
> It appears that libpng12-0 is effectively not available in Sid for amd64 architecture:
> I guess that brial was built within a Jessie environment or something.
> Second, I am surprised to meet PNG here.
> 

Ok, I still had libpng12-0 installed in my unstable chroot. It was only
removed from unstable in May. I'll reupload a version of the package
without the dependency.

Best,
Tobias