Ubuntu 19.04 (Disco Dingo) CRAN repo update error

Hi,

I attempted to update using apt update and apt full-upgrade today, and got the following error message:
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu disco-cran35/ Release' is no longer signed.

Ahnaf

Ahnaf and other Ubuntu users,

The server used to house the repository before it is mirrored to CRAN 
had a hard drive failure last week.  I had to reconstruct the server and 
took the opportunity to update to the latest LTS version of Ubuntu.  A 
couple of issues have been discovered, this being one of them.  I have 
fixed this, and the error should go away after the next CRAN sync.

Good news is that none of the base packages mirrored on CRAN have been 
updated while my server was off line.  The "no longer signed" error 
should disappear within 24 hours.

Michael