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could not installlibstdc++5

hi,

i use ubuntu 10.04. i type sudo apt-get install libstdc++5 but always noticed

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libstdc++5 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package libstdc++5 has no installation candidate

how to solve. thanks