If you receive the following error when updating and Ubuntu machine that
utilizes the CRAN based Ubuntu repositories, there is a simple fix.
The following signatures were invalid: EXPKEYSIG 51716619E084DAB9
Michael Rutter <marut...@gmail.com>
EXPKEYSIG indicates that the key on your system has expired. I renewed
my key a month ago, so you just need to update my key using normal
procedures. For example:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys
E298A3A825C0D65DFD57CBB651716619E084DAB9
Or any of the other methods mentioned on the CRAN Ubuntu page
(https://cran.r-project.org/bin/linux/ubuntu/).
If you have any questions, please let me know.
Michael
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