How to replace corrupt files

Dear fellow Trisquel users,

How do you replace corrupt files? For example:
$ sudo debsums -e | grep FAILED
/etc/apparmor.d/php-fpm FAILED
/etc/apparmor.d/bin.ping FAILED
/etc/apparmor.d/usr.sbin.dnsmasq FAILED
/etc/apparmor.d/usr.bin.irssi FAILED
/etc/issue.net FAILED
/etc/grub.d/00_header FAILED
/etc/grub.d/10_linux FAILED
/etc/grub.d/40_custom FAILED
/etc/grub.d/30_os-prober FAILED
/etc/security/limits.conf FAILED
/etc/sane.d/dll.conf FAILED
/etc/login.defs FAILED
/etc/sudoers FAILED
/etc/apt/apt.conf.d/10periodic FAILED

Thank you very much!