Not a bug of ubuntu-release-upgrader, but a package dependency problem
(see tail of apt.log bellow). Uninstalling lintian package allows the
upgrade to proceed.
```
...
Investigating (19) libyaml-libyaml-perl:amd64 < 0.89+ds-1ubuntu0.24.04.1 ->
0.904.0+ds-1 @ii umU Ib >
Broken libyaml-libyaml-perl:amd64 Breaks on lintian:amd64 < 2.117.0ubuntu1.4 |
2.129.0ubuntu1 @ii umH > (< 2.119.0~)
Considering lintian:amd64 -1 as a solution to libyaml-libyaml-perl:amd64 1
Upgrading lintian:amd64 due to Breaks field in libyaml-libyaml-perl:amd64
Investigating (19) lintian:amd64 < 2.117.0ubuntu1.4 -> 2.129.0ubuntu1 @ii umU
Ib >
Broken lintian:amd64 Depends on dpkg:amd64 < 1.22.6ubuntu6.5 | 1.23.7ubuntu1
@ii umH > (>= 1.23.4)
Considering dpkg:amd64 5394 as a solution to lintian:amd64 -1
MarkKeep lintian:amd64 < 2.117.0ubuntu1.4 -> 2.129.0ubuntu1 @ii umU Ib > FU=0
Holding Back lintian:amd64 rather than change dpkg:amd64
Done
```
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2147155
Title:
Upgrade from 24.04.4 to 26.04 failed: An unresolvable problem occurred
while calculating the upgrade.
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