NextcloudPi Update to v1.3 not possible

Nextcloud version (eg, 18.0.2) : 18.0.7.1
Operating system and version (eg, Ubuntu 20.04) : Debian GNU/Linux 10 \n \l
Apache or nginx version (eg, Apache 2.4.25) : 2.4.38
PHP version (eg, 7.1) : 7.3.19-1
NextCloudPlus: v 1.28.1

When Updating to NextCloudPlus, I get the following error messages:

version v1.30.0 is available

Update NextCloudPi

[ nc-update ] (Mon Sep 21 09:28:45 CEST 2020)
Downloading updates
Performing updates
Hit:1 http://packages.x2go.org/debian buster InRelease
Hit:2 http://security.debian.org/debian-security buster/updates InRelease
Hit:3 http://deb.debian.org/debian buster InRelease
Hit:4 http://deb.debian.org/debian buster-updates InRelease
Hit:5 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:6 https://deb.nodesource.com/node_10.x buster InRelease
Get:7 http://ppa.launchpad.net/jtaylor/keepass/ubuntu focal InRelease [17.5 kB]
Get:8 http://ppa.launchpad.net/snappy-dev/image/ubuntu focal InRelease [18.1 kB]
Get:9 http://ppa.launchpad.net/yktooo/ppa/ubuntu focal InRelease [17.5 kB]
Err:7 http://ppa.launchpad.net/jtaylor/keepass/ubuntu focal InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 7858088158B80F90
Err:8 http://ppa.launchpad.net/snappy-dev/image/ubuntu focal InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY F1831DDAFC42E99D
Err:9 http://ppa.launchpad.net/yktooo/ppa/ubuntu focal InRelease
The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 66EFE2D582CE5D8A
Reading package lists…

W: GPG error: http://ppa.launchpad.net/jtaylor/keepass/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 7858088158B80F90
E: The repository ‘http://ppa.launchpad.net/jtaylor/keepass/ubuntu focal InRelease’ is not signed.
W: GPG error: http://ppa.launchpad.net/snappy-dev/image/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY F1831DDAFC42E99D
E: The repository ‘http://ppa.launchpad.net/snappy-dev/image/ubuntu focal InRelease’ is not signed.
W: GPG error: http://ppa.launchpad.net/yktooo/ppa/ubuntu focal InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 66EFE2D582CE5D8A
E: The repository ‘http://ppa.launchpad.net/yktooo/ppa/ubuntu focal InRelease’ is not signed.

Could you please run ncp-report and share output via pastebin?
How did you install? (Link to procedure, docs or howto please?)
ppa’s ar not part of regular ncp Debian installation afaik.

Thank you, here is the report:

Sorry I cannot find the docs how I installed, this was 2-3 years ago, but I did it via apt. Does that help? It was working well until I moved to another city.

Sorry i do not use Ubuntu or PPA. But i think you must add the key.
If NextcloudPi has got a meachnism please do not test it:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F1831DDAFC42E99D

I do not us Ubuntu or ppa’s either.
He must have added them manually

Yes, I added them manually. I am using Debian btw. Is the installation method import? As stated, it worked so far, just suddenly I have this problem.