file conflict when installing libsgutils-2-1.46-2 when upgrading from lunar to mantic

[ Impact ]

A release upgrade from lunar to mantic, or jammy to mantic when lunar goes EOL, will encounter a file conflict in the libgsutils2 library.

This is what the library package is named, and the library it ships, in each relevant ubuntu release:

Jammy: 1.46-1build1
package: libsgutils2-2
ships: libsgutils2-1.46.so.2 and libsgutils2-1.46.so.2.0.0

Lunar: 1.46-1ubuntu0.23.04.1
package: libsgutils2-2
ships: libsgutils2-1.46.so.2 and libsgutils2-1.46.so.2.0.0

Mantic and Noble: 1.46-3ubuntu2
package: libsgutils2-1.46-2
ships: libsgutils2-1.46.so.2 and libsgutils2-1.46.so.2.0.0

The problem is that in the jammy and lunar versions the file that libgsutils2-2 ships conflicts with mantic, where the package was renamed to libgsutils2-1.46-2.

This update corrects the version of the existing breaks/replaces in the mantic package to avoid this conflict.

Note that, if the upgrade is done with do-release-upgrade, the conflict does not cause an abort, because dpkg is called with --force (see comment #3 down below).

[ Test Plan ]

Perform a release upgrade from lunar to mantic, with mantic-proposed enabled (I'm not yet sure how to have mantic-proposed enabled for do-release-upgrade: I'll come back to this once the package is in proposed). Check the upgrade logs in /var/log/dist-upgrade/apt-term.log and look for the part where libsgutils2 is being unpacked.

For example, this shows the problem:
Preparing to unpack .../125-libsgutils2-1.46-2_1.46-3ubuntu2_amd64.deb ...^M
Unpacking libsgutils2-1.46-2:amd64 (1.46-3ubuntu2) ...^M
dpkg: warning: overriding problem because --force enabled:^M
dpkg: warning: trying to overwrite '/usr/lib/x86_64-linux-gnu/libsgutils2-1.46.so.2.0.0', which is also in package libsgutils2-2:amd64 1.46-1ubuntu0.23.04.1^M
dpkg: warning: overriding problem because --force enabled:^M
dpkg: warning: trying to overwrite '/usr/lib/x86_64-linux-gnu/libsgutils2-1.46.so.2', which is also in package libsgutils2-2:amd64 1.46-1ubuntu0.23.04.1^M

This grep command can also be used:
$ grep "trying to overwrite" /var/log/dist-upgrade/apt-term.log
dpkg: warning: trying to overwrite '/usr/lib/x86_64-linux-gnu/libsgutils2-1.46.so.2.0.0', which is also in package libsgutils2-2:amd64 1.46-1ubuntu0.23.04.1
dpkg: warning: trying to overwrite '/usr/lib/x86_64-linux-gnu/libsgutils2-1.46.so.2', which is also in package libsgutils2-2:amd64 1.46-1ubuntu0.23.04.1

With the fixed version, there will be no such dpkg warning when unpacking libsgutils2 (example with a PPA, since the package is not yet in proposed, but the file to check, and grep command, are the same):

$ grep "trying to overwrite" /var/log/dist-upgrade/apt-term.log
$ # empty result, no hits

Locating the unpacking section in that log, we see that the conflicting package is removed before (took the example from a ppa build):

Removing libsgutils2-2:amd64 (1.46-1ubuntu0.23.04.1) ...^M
Selecting previously unselected package libsgutils2-1.46-2:amd64.^M
(Reading database ... ^M(Reading database ... 5%^M(Reading database ... 10%^M(Reading database ... 15%^M(Reading database ... 20%^M(Reading database ... 25%^M(Reading databas
Preparing to unpack .../libsgutils2-1.46-2_1.46-3ubuntu2.1~ppa3_amd64.deb ...^M
Unpacking libsgutils2-1.46-2:amd64 (1.46-3ubuntu2.1~ppa3) ...^M

[ Where problems could occur ]
Should this package ever get a version bump in an SRU, then the breaks/replaces version might need a bump, which can easily be forgotten. Something similar happened to a samba security update[1] a while ago. Looking at the history of sg3-utils in SRUs, however, shows that such a bump was never done, so it's unlikely. But if it happens, then this bug will resurface.

1. https://bugs.launchpad.net/bugs/2024663

[ Other Info ]

N/A

[Original Description]

While upgrading from lunar to mantic dpkg aborted with this error:

```
Preparing to unpack .../libsgutils2-1.46-2_1.46-3ubuntu2_amd64.deb ...
Unpacking libsgutils2-1.46-2:amd64 (1.46-3ubuntu2) ...
dpkg: error processing archive /var/cache/apt/archives/libsgutils2-1.46-2_1.46-3ubuntu2_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libsgutils2-1.46.so.2.0.0', which is also in package libsgutils2-2:amd64 1.46-1ubuntu0.22.04.1
```

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: libsgutils2-2 1.46-1ubuntu0.22.04.1
ProcVersionSignature: Ubuntu 6.2.0-33.33-generic 6.2.16
Uname: Linux 6.2.0-33-generic x86_64
NonfreeKernelModules: vboxnetadp vboxnetflt vboxdrv amddrm_ttm_helper amdttm amdxcp amddrm_buddy amd_sched amdkcl
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: GNOME
Date: Fri Oct 13 15:29:48 2023
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: sg3-utils
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2018-06-16T17:39:00.798346