Trying to add the PPA for the cinnamon desktop as suggested by many sites (e.g. How do I install the Cinnamon Desktop?) gives the following error:
~$ sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
You are about to add the following PPA to your system:
tag:launchpad.net:2008:redacted
More info: https://launchpad.net/~gwendal-lebihan-dev/+archive/cinnamon-stable
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpnAEMcK/secring.gpg' created
gpg: keyring `/tmp/tmpnAEMcK/pubring.gpg' created
gpg: "tag:launchpad.net:2008:redacted" not a key ID: skipping
recv failed
I understand that this type of error comes up when a PPA is no longer being maintained (but there is no indication of this for the cinnamon-stable PPA on forums etc.)
I'm able to add other PPAs without error (cinnamon-nightly works just fine, but I don't want an unstable release). Any suggestions on how to resolve this?
EDIT: I should have mentioned I'm using Ubuntu 12.04
EDIT (23/05/2014): My question has been marked duplicate because the answer on [How do I install the Cinnamon Desktop?] has since changed to reflect the status of the PPA (it has been deleted). However, I think my question should remain here because it highlight the error that users will experience if they follow the cinnamon installation instructions on the many fora out there.