I suspect this is because you have configured your sources.list file to
communicate via ftp.
2020-09-08 20:07:42,661 DEBUG Checking pkg: ubuntu-standard
2020-09-08 20:07:42,664 DEBUG examining: 'deb
ftp://ftp.fu-berlin.de/linux/ubuntu/ bionic main restricted'
2020-09-08 20:07:42,664 DEBUG verifySourcesListEntry: deb
ftp://ftp.fu-berlin.de/linux/ubuntu/ focal main restricted
2020-09-08 20:07:42,664 DEBUG url_downloadable:
ftp://ftp.fu-berlin.de/linux/ubuntu//dists/focal/Release
2020-09-08 20:07:42,664 DEBUG s='ftp' n='ftp.fu-berlin.de'
p='/linux/ubuntu//dists/focal/Release' q='' f=''
2020-09-08 20:07:42,840 DEBUG error from ftplib: '550 SIZE not allowed in ASCII
mode'
2020-09-08 20:07:42,841 DEBUG entry '# deb ftp://ftp.fu-berlin.de/linux/ubuntu/
bionic main restricted' was disabled (no Release file)
2020-09-08 20:07:42,842 DEBUG examining: 'deb
ftp://ftp.fu-berlin.de/linux/ubuntu/ bionic-updates main restricted'
2020-09-08 20:07:42,842 DEBUG entry '# deb ftp://ftp.fu-berlin.de/linux/ubuntu/
bionic-updates main restricted' was disabled (no Release file)
Please switch to using http and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1894885
Title:
error while upgrade ubuntu 18 LTS to 20 LTS: comm: /var/log/dmesg: No
such file or directory
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