Thank you for taking the time to report this issue and help to improve
Ubuntu.
The file /usr/lib/update-notifier/package-data-downloader belongs to the
update-notifier-common package. If this file is missing from your
system, you have a corrupt installation.
In addition, your bug report shows that you are running Ubuntu 15.04,
which is no longer supported. It is strongly recommended that you
upgrade to a supported version of Ubuntu.
** Changed in: update-notifier (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1620208
Title:
package update-notifier-common 3.160 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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