notes/ubuntu/apt.md

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was getting this error:
pt@r710:~$ sudo apt update
[sudo] password for pt:
Hit:1 http://download.virtualbox.org/virtualbox/debian bionic InRelease
Hit:2 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:3 https://dl.yarnpkg.com/debian stable InRelease
Hit:4 https://deb.nodesource.com/node_13.x bionic InRelease
Hit:5 http://apt.postgresql.org/pub/repos/apt bionic-pgdg InRelease
Hit:6 http://ppa.launchpad.net/certbot/certbot/ubuntu bionic InRelease
Get:7 http://archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit:8 https://download.jitsi.org stable/ InRelease
Ign:9 https://dl.packager.io/srv/deb/pghero/pghero/master/ubuntu 18.04 InRelease
Get:10 http://archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:11 https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/ InRelease [3,626 B]
Get:12 http://archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:13 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [1,726 kB]
Err:11 https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/ InRelease
The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <marutter@gmail.com>
Ign:14 https://download.webmin.com/download/repository sarge InRelease
Hit:15 https://download.webmin.com/download/repository sarge Release
Get:17 https://dl.packager.io/srv/deb/pghero/pghero/master/ubuntu 18.04 Release
Get:19 http://archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1,680 kB]
Fetched 3,663 kB in 2s (1,627 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/ InRelease: The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <marutter@gmail.com>
W: Failed to fetch https://cloud.r-project.org/bin/linux/ubuntu/bionic-cran40/InRelease The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <marutter@gmail.com>
W: Some index files failed to download. They have been ignored, or old ones used instead.
ran the following command using key signature from above.
it is supposed to import the gpg key from the target repository into the local database.
[askubunut](https://askubuntu.com/questions/131601/gpg-error-release-the-following-signatures-were-invalid-badsig)
pt@r710:~$ gpg --keyserver keyserver.ubuntu.com --recv-keys 51716619E084DAB9
gpg: key 51716619E084DAB9: public key "Michael Rutter <marutter@gmail.com>" imported
gpg: Total number processed: 1
gpg: imported: 1