This is fixed in feisty.
The extended_states file is just like the lists files readable by
default for others (0644) now regardless of the umask.
If someone has concerns about this, he can always chmod 0700
/var/lib/apt (but this will break tools like update-manager).
Cheers,
Michael
** Changed in: apt (Ubuntu)
Status: Confirmed => Fix Released
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[feisty] command line apt-get/aptitude breaks update-manager with certain umask
settings
https://launchpad.net/bugs/74190
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