Try running apt-get update and then the dist-upgrade again, it seems to
be a problem with your network connection and not an update-manager bug,
thanks.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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[apport] package update-manager failed to install/upgrade: ErrorMessage:
SystemError in cache.commit(): installArchives() failed
https://bugs.launchpad.net/bugs/162138
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