Off topic:apt-get update showing error
Entering edit mode
12 months ago
harry ▴ 30
$sudo apt-get update
[sudo] password for aclab:
Hit:1 bionic InRelease
Hit:2 stable InRelease
Get:3 bionic InRelease [64.4 kB]
Get:4 bionic-updates InRelease [88.7 kB]
Get:5 bionic-backports InRelease [74.6 kB]
Hit:6 trusty-stable InRelease
Get:7 bionic-cran35/ InRelease [3,626 B]
Err:7 bionic-cran35/ InRelease
  The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <>
Get:8 bionic-updates/main i386 Packages [1,162 kB]
Get:9 bionic-security InRelease [88.7 kB]
Get:10 bionic-security/main amd64 DEP-11 Metadata [48.9 kB]
Get:11 bionic-security/universe amd64 DEP-11 Metadata [59.5 kB]
Get:12 bionic-updates/main amd64 Packages [1,761 kB]
Get:13 bionic-security/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:14 bionic-updates/main Translation-en [373 kB]
Get:15 bionic-updates/main amd64 DEP-11 Metadata [295 kB]
Get:16 bionic-updates/restricted i386 Packages [17.4 kB]
Get:17 bionic-updates/restricted amd64 Packages [196 kB]
Get:18 bionic-updates/restricted Translation-en [26.3 kB]
Get:19 bionic-updates/universe i386 Packages [1,547 kB]
Get:20 bionic-updates/universe amd64 Packages [1,692 kB]
Get:21 bionic-updates/universe Translation-en [355 kB]
Get:22 bionic-updates/universe amd64 DEP-11 Metadata [288 kB]
Get:23 bionic-updates/universe DEP-11 64x64 Icons [488 kB]
Get:24 bionic-updates/multiverse i386 Packages [14.4 kB]
Get:25 bionic-updates/multiverse amd64 Packages [36.2 kB]
Get:26 bionic-updates/multiverse Translation-en [7,308 B]
Get:27 bionic-updates/multiverse amd64 DEP-11 Metadata [2,464 B]
Get:28 bionic-backports/universe amd64 DEP-11 Metadata [9,288 B]
Fetched 8,701 kB in 5s (1,743 kB/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: bionic-cran35/ InRelease: The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <>
W: Failed to fetch  The following signatures were invalid: EXPKEYSIG 51716619E084DAB9 Michael Rutter <>
W: Some index files failed to download. They have been ignored, or old ones used instead.

Can someone help me why i getting these errors Thanks in advance to solve this issue.

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