[Bug 2045114] [NEW] do-release-upgrade fails with just 'An unresolvable problem occurred while calculating the upgrade'

[trozen]

Public bug reported:

do-release-upgrade fails with a message:

```
An unresolvable problem occurred while calculating the upgrade. 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 
```

However, there's not really significant information in the logs.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: ubuntu-release-upgrader-core 1:23.04.7
ProcVersionSignature: Ubuntu 6.2.0-37.38-generic 6.2.16
Uname: Linux 6.2.0-37-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Nov 29 09:33:55 2023
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to lunar on 2023-11-29 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade lunar

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https://bugs.launchpad.net/bugs/2045114

Title:
  do-release-upgrade fails with just 'An unresolvable problem occurred
  while calculating the upgrade'

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  do-release-upgrade fails with a message:

  ```
  An unresolvable problem occurred while calculating the upgrade. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 
  ```

  However, there's not really significant information in the logs.

  ProblemType: Bug
  DistroRelease: Ubuntu 23.04
  Package: ubuntu-release-upgrader-core 1:23.04.7
  ProcVersionSignature: Ubuntu 6.2.0-37.38-generic 6.2.16
  Uname: Linux 6.2.0-37-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.26.1-0ubuntu2.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov 29 09:33:55 2023
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to lunar on 2023-11-29 (0 days ago)

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