I was also surprised when I found my GRE tunnels didn't come up after applying 
precise-updates.
It took me half an hour to find that it was due to ifupdown.
strace(8) helped me to find ifup was aborted at "ip link set dev gre1 up" 
without preceding "ip tunnel add gre1 ..."

 auto gre1
 iface gre1 inet manual
-    up ip tunnel add gre1 mode gre local 10.134.126.59 remote 172.16.17.4
-    up ip link set gre1 up
+    pre-up ip tunnel add gre1 mode gre local 10.134.126.59 remote 172.16.17.4
     up ip link set gre1 mtu 1400
     up ip addr add 10.202.252.253/30 dev gre1

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https://bugs.launchpad.net/bugs/1305271

Title:
  Manual interfaces do not come up

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