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launchpad-getkeys breaks apt keys db with new GPG tools present in Ubuntu 18.04.
New GPG tools have different default format for keyring files called
keybox. keybox is not supported by apt-key and other apt tools.
So, when older script tries to add key to /etc/apt/trusted.gpg,
after that file can not be read by apt tools and apt tools start to fail hard
(not with warnings, but with real errors and non zero return codes).
So, fix in
#3
creates keyring on side and then exports key in old fashioned
format to /etc/apt/trusted.gpg.d/
where it is picked up by apt tools normally.

Without proxy, import of keys fails on Ubuntu 18.04 with:
gpg: keyserver receive failed: IPC syntax error

See actual log below.

$ sudo launchpad-getkeys

Please wait... launchpad-getkeys is running an update so
it can detect the missing GPG keys

Trying to import all the missing keys
Executing: /tmp/apt-key-gpghome.H3AosliOXC/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --keyserver-options http-proxy= --recv-keys 0E08A149DE57BFBE
gpg: keyserver receive failed: IPC syntax error
Executing: /tmp/apt-key-gpghome.z5nl9JVhCf/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --keyserver-options http-proxy= --recv-keys 0E08A149DE57BFBE
gpg: keyserver receive failed: IPC syntax error
Executing: /tmp/apt-key-gpghome.Eoy9h0GIvD/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --keyserver-options http-proxy= --recv-keys

launchpad-getkeys has finished importing all missing GPG keys.
Try running sudo apt-get update - you shouldn't see any key
errors any more.
.............................................................
Note that launchpad-getkeys imports missing GPG keys but does
not fix broken keys.

It is visible that gpg is not able to work correctly with empty value for proxy:
--keyserver-options http-proxy=