#tried to update kde neon to 24.04 but got an error, don't know how to proceed

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lone coyote
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hi, I was trying to update KDE Neon from 22.04 to 24.04, but near the end I received an error message. It's too long to paste, so here's the last bit:

  File "/usr/lib/python3/dist-packages/apt/cache.py", line 214, in open
    self._cache = apt_pkg.Cache(progress)
apt_pkg.Error: E:Conflicting values set for option Signed-By regarding source https://packages.mozilla.org/apt/ mozilla: /etc/apt/keyrings/packages.mozilla.org.asc != /etc/apt/keyrings/org.kde.neon.packages.mozilla.org.asc, E:The list of sources could not be read.
Removed "/run/systemd/system/packagekit.service".
Removed "/run/systemd/system/packagekit.socket".

I use firefox nightly, so that might be related.
I tried manually editing org.kde.neon.packages.mozilla.org.sources and then:
>sudo do-release-upgrade

There is no development version of an LTS available.
To upgrade to the latest non-LTS development release 
set Prompt=normal in /etc/update-manager/release-upgrades.```
`>lsb_release -a`
```No LSB modules are available.
Distributor ID: Neon
Description:    KDE neon 6.2
Release:        24.04
Codename:       noble```
`>pkcon update`
```Fatal error: The following packages have unmet dependencies:
  libkdecorations2-6: Breaks: libkdecorations2-5v5 (< 4:5.91) but 4:5.27.11-0ubuntu2 is to be installed
  libkdecorations2private11: Breaks: libkdecorations2private10 (< 4:6.0.0) but 4:5.27.11-0ubuntu2 is to be installed

So I am not sure now if the update was successful or if I have a borked install now

lone coyote
#

I uninstalled kwin-bismuth and I'm now trying to do full-upgrade