I have been unable to run apt get update command properly due to many errors that seem to suggest some repositories are unavailable. I tried 'apt-get clean' but it did not help. I have the following message (Ubuntu 18.04)
Err:13 http://uk.archive.ubuntu.com/ubuntu bionic amd64 Contents (deb)
File has unexpected size (39528051 != 92769273). Mirror sync in progress? [IP: 2001:67c:1360:8001::23 80]
Hashes of expected file:
- Filesize:92769273 [weak]
- SHA256:5b4dd447bb35deb5a446cef9b30cbc78dde20bd58598bee8e9744c97c370e667
- SHA1:542e69afb40e026121a9d9ff31ed5649486d73cb [weak]
- MD5Sum:f1ffee77dbd97765067212ecec7a977a [weak]
Release file created at: Thu, 23 Jul 2020 07:19:14 +0000
Hit:16 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu bionic InRelease
Get:15 http://uk.archive.ubuntu.com/ubuntu bionic i386 Contents (deb) [56.1 MB]
Err:15 http://uk.archive.ubuntu.com/ubuntu bionic i386 Contents (deb)
Err:17 https://cloud.r-project.org/bin/linux/ubuntu eoan-cran35/ Release
404 Not Found [IP: 2600:9000:2131:9000:6:c2d3:f940:93a1 443]
Hit:18 http://ppa.launchpad.net/thopiekar/miraclecast/ubuntu bionic InRelease
Hit:19 http://ppa.launchpad.net/ubuntuhandbook1/avidemux/ubuntu bionic InRelease
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>
Reading package lists... Done
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu eoan-cran35/ Release' no longer has a Release file.
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.
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>
Could I ask what I should do to fix this please?
