Destroyed /usr/local partition

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http://askubuntu.com – I've got three partitions at installation of Ubuntu 12.04, whose mount points are: / /usr/local /home But I needed a partition so I merged /usr/local by copying all its contents into a folder named local2. Then I dismounted and formatted partition of /usr/local, and then I moved the folder local2 to /usr/local. Ubuntu seems to work fine, but when I turn on PC, Ubuntu start screen says (more or less): /usr/local partition not found. Press S to skip or M to mount it manually. How can I fix this? (HowTos)