Abort, sha256sum returned an error 4

[tuananh]

Finding latest version available on kernel.ubuntu.com
Latest version is v5.16.0 but seems its already installed, continue? (y/N)
Expected to need to download 6 files but found 10, continue? (y/N)
Will download 10 files from kernel.ubuntu.com:
Downloading amd64/linux-headers-5.16.0-051600-generic_5.16.0-051600.202201091830_amd64.deb: 100%
Downloading amd64/linux-headers-5.16.0-051600-generic_5.16.0-051600.202201092355_amd64.deb: 100%
Downloading amd64/linux-headers-5.16.0-051600_5.16.0-051600.202201091830_all.deb: 100%
Downloading amd64/linux-headers-5.16.0-051600_5.16.0-051600.202201092355_all.deb: 100%
Downloading amd64/linux-image-unsigned-5.16.0-051600-generic_5.16.0-051600.202201091830_amd64.deb: 100%
Downloading amd64/linux-image-unsigned-5.16.0-051600-generic_5.16.0-051600.202201092355_amd64.deb: 100%
Downloading amd64/linux-modules-5.16.0-051600-generic_5.16.0-051600.202201091830_amd64.deb: 100%
Downloading amd64/linux-modules-5.16.0-051600-generic_5.16.0-051600.202201092355_amd64.deb: 100%
Downloading amd64/CHECKSUMS: 100%
Downloading amd64/CHECKSUMS.gpg: 100%
Signature of checksum file has been successfully verified
Abort, sha256sum returned an error 4

any idea what causes this?

[2ndMessiah]

root@ubuntu:~# ubuntu-mainline-kernel.sh -i
Finding latest version available on kernel.ubuntu.com
Latest version is: v5.16.5, continue? (y/N)
Disable signature check, gpg not available
Expected to need to download 6 files but found 4, continue? (y/N)
Will download 4 files from kernel.ubuntu.com:
Downloading amd64/linux-headers-5.16.5-051605-generic_5.16.5-051605.202202011731_amd64.deb: 100%
Downloading amd64/linux-headers-5.16.5-051605_5.16.5-051605.202202011731_all.deb: 100%
Downloading amd64/linux-image-unsigned-5.16.5-051605-generic_5.16.5-051605.202202011731_amd64.deb:  100%
Downloading amd64/linux-modules-5.16.5-051605-generic_5.16.5-051605.202202011731_amd64.deb: 100%
Abort, sha256sum returned an error 0

mine.