You seem to have a syntax error in your /etc/environment file.
/etc/environment: line 2: /home/steve: Is a directory
You'll need to manually resolve this issue.
** Changed in: texinfo (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/773452
Title:
package install-info 4.13a.dfsg.1-6ubuntu3 failed to install/upgrade:
subprocess installed post-installation script returned error exit
