Thank you for your bug report. The problem is line 2 of your /etc/environment
file:
LC_TIME='en_AU.utf8
It uses an opening single quote but a closing double quote -- this has to be
consistent. BTW, you do not need any quotes at all, i.e. you could use:
LC_TIME=en_AU.utf8
I am closing this bug
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https://bugs.launchpad.net/bugs/774796
Title:
package install-info 4.13a.dfsg.1-5ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit