** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1928546
Title:
Could not calculate the upgrade An unresolvable problem occurred
while calculating the upgrade. This was caused by: * Upgrading to a
pre-release version of Ubuntu This is most likely a transient problem,
please try again later. If none of this applies, then please report
this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core'
in a terminal. If you want to investigate this yourself the log files
in '/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'. drian@wad:~$ update-
manager -d Checking for a new Ubuntu release Checking for a new Ubuntu
release authenticate 'hirsute.tar.gz' against 'hirsute.tar.gz.gpg'
extracting 'hirsute.tar.gz' No candidate ver: libpng12-0:i386 No
candidate ver: libtiff4:i386
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