Hi Saurav, thanks for taking the time to file this bug report and help
us make Ubuntu better.
This is the relevant error:
useradd: cannot lock /etc/passwd; try again later.
This is a temporary problem that can happen if two things are reading or
writing to /etc/passwd at the same time.
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https://bugs.launchpad.net/bugs/746963
Title:
package clamav-base (not installed) failed to install/upgrade:
subprocess installed post-installation script returned
