This affects me too.. In my case below is the log:
[pushpi@PUSHPI-PC ~]sudo do-release-upgrade -d
Checking for a new Ubuntu release
ERROR:root:parse failed for
'/var/lib/update-manager/meta-release-lts-development'
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line
368, in download
self.parse()
File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line
239, in parse
while index_tag.step():
SystemError: E:Unable to parse package file (1)
Upgrades to the development release are only
available from the latest supported release.
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https://bugs.launchpad.net/bugs/1293475
Title:
E:Unable to parse package file /var/lib/apt/lists/za.archive.ubuntu
.com_ubuntu_dists_precise-updates_main_i18n_Translation-en (1), E:The
package lists or status file could not be parsed or opened.
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