> open("/usr/share/locale/en_IE/LC_MESSAGES/shadow.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/usr/share/locale/en/LC_MESSAGES/shadow.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/usr/share/locale-langpack/en_IE/LC_MESSAGES/shadow.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/usr/share/locale-langpack/en/LC_MESSAGES/shadow.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
> write(2, "su: Module is unknown\n(Ignored)\n", 32su: Module is unknown (Ignored)) = 32
Looks like shadow.mo is missing. dpkg -S shadow.mo says that it should be in
the login package.
apt-get --reinstall install login
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