Bug#1083022: crossgrader: dpkg error "trying to overwrite shared '/usr/lib/systemd/user/tumblerd.service', which is different from other instances of package tumbler:amd64"

[magnus@autistici.org]

Hi Helmut,

On 2024-09-30 05:28, Helmut Grohne wrote:

> Control: reassign -1 tumbler
> Control: found -1 4.18.0-1
> Control: retitle -1 tumbler fails to coinstall: trying to overwrite 
> shared '/usr/lib/systemd/user/tumblerd.service'
> Control: severity -1 serious
> Control: affects -1 + crossgrader
>
> Hi Magnus,
>
> On Mon, Sep 30, 2024 at 04:00:15AM +0000, magnus@autistici.org wrote:
> > To test crossgrader I installed a standard Xfce Desktop system of
> > Debian bookworm i386/i686 and used crossgrader following the
> > "official" documentation:
> >
> > https://salsa.debian.org/crossgrading-team/debian-crossgrading/-/blob/master/INSTRUCTIONS.md
> >
> >
> > But during the second stage I got the following error regarding
> > the package tumbler:
> >
> >    Unpacking tumbler:amd64 (4.18.0-1) ...
> >    dpkg: error processing archive
> > /var/cache/apt/archives/tumbler_4.18.0-1_amd64.deb (--install):
> >    trying to overwrite shared 
> > '/usr/lib/systemd/user/tumblerd.service',
> > which is different from
> >    other instances of package tumbler:amd64

[...]

> It's a bug in tumbler as it declares to be coinstallable but actually 
> is
> not. Dropping "Multi-Arch: same" from tumbler is the simplest way of
> resolving this. The problem is also reported by the multiarch hinter on
> tracker.d.o and exists in both bookworm and sid.

Thank you for acting so quickly on the bug report and the explanation!
And yes, I found the multiarch issue here:
https://tracker.debian.org/pkg/tumbler

Kind regards, Magnus