signatures couldn't be verified
Hi Folks. This tool looks like exactly what I am looking for. But... I can't install.
On adding the source to the source file ... I get
Get:12 https://downloads.syncevolution.org/apt stable InRelease [11.8 kB]
Err:12 https://downloads.syncevolution.org/apt stable InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8EF2B1796F4B7755
Adding the instructed key I get...
$ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 43D03AD9 Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). Executing: /tmp/apt-key-gpghome.F1Odw7Se2u/gpg.1.sh --keyserver keyserver.ubuntu.com --refresh-keys 43D03AD9
If I add
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8EF2B1796F4B7755
I then get (on apt-get update)...
The following signatures were invalid: EXPKEYSIG 8EF2B1796F4B7755 SyncEvolution syncevolution@syncevolution.org ... W: GPG error: https://downloads.syncevolution.org/apt stable InRelease: The following signatures were invalid: EXPKEYSIG 8EF2B1796F4B7755 SyncEvolution syncevolution@syncevolution.org E: The repository 'https://downloads.syncevolution.org/apt stable InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
Any help would be much appreciated.