problems upgrading from 14.04 to 16.04

[Oliver Grawert]

hi,
On Mi, 2016-09-28 at 19:45 +0200, Ralf Mardorf wrote:
> On Wed, 28 Sep 2016 18:42:28 +0200, Oliver Grawert wrote:
> > 
> > Am Mittwoch, den 28.09.2016, 18:18 +0200 schrieb Ralf Mardorf:
> > > 
> > > > 
> > > > My apologies :D, wrong package. To be continued...  
> > > Ok, this is the correction, so from where exactly is gcc-5-base
> > > 5.4.1-2ubuntu1~14.04?  
> > 
> > from the toolchain PPA most likely, i think that is the only place
> > where a gcc5 for trusty exist at all ...
> 
> I know this, but seemingly the OP doesn't know. A PPA, proposed
> etc. aren't official repositories. 

well ... in case of the toolchain PPA this is the only way to get a
(semi) supported gcc version for an older release ...

if the source code you build for your job requires gcc5 features but
your company only supports 14.04 installs on the workstations this PPA
is provided by the ubuntu toolchain team for you ... 
(though preferably you would use a chroot and not taint your host
system with such a hackery ... to not break ... well ... upgrades :P )

i guess tom is on the right path here already with his
-o Dpkg::Options::="--force-all" and the forcing of the version ... 

if that doesn't work, there is still dpkg itself to force install all
the debs manually in the right combination and have apt-get -f install
solve the higher level dependency stuff afterwards.

ciao
	oli
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