I am extremely happy with KDE Neon running on my laptop. I have spent a fair amount of time trying to keep the system as KDE vanilla as possible, with all of my programs KDE based and compatible with KDE Plasma 5. As a KDE newbie, I would like to transfer all of my software installation info over to my desktop computer after I install KDE Neon on it. I have learned that I can use the 'apt-clone' tool to transfer all info about my installed software into an apt-clone.tar.gz file that I can transfer to my new desktop system. What can I do to transfer custom PPA info and their keys over to the new system? Both computers use the software for the same platform, so that shouldn't be any problem.

Any ideas?

Hi!

There are some options you could use:
clone the entire partition/disk and use it in your desktop machine (has to be the same architecture)
OR
save sources:

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find /etc/apt/sources.list* -type f -name '*.list' -exec bash -c 'echo -e "\n## $1 ";grep "^[[:space:]]*[^#[:space:]]" ${1}' _ {} \; > sources.list.save

to save your sources to the file sources.list.save. Have a look at it to know what you are doing and do not trust copy&paste

save package states:

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apt-mark showauto > package-states-auto
apt-mark showmanual > package-states-manual  #manual installes packages


save installed packages:

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dpkg --get-selections  | awk '!/deinstall|purge|hold/ {print $1}' > packages.list.save

save keys (keyring):

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sudo cp /etc/apt/trusted.gpg trusted-keys.gpg  #manual keys in keyring
sudo cp -R /etc/apt/trusted.gpg.d trusted.gpg.d.save #folder with installed keyrings


on target system:

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sudo apt-key add trusted-keys.gpg #copy folder if needed too!!!
sudo cp sources.list.save /etc/apt/sources.list
sudo apt update
xargs -a "packages.list.save" sudo apt-get install
xargs -a "package-states-auto" sudo apt-mark auto
xargs -a "package-states-manual" sudo apt-mark manual

If you're able to read german, theres a wiki on ubuntuusers.de showing the entire process and a lot of informations.