[R] permutations

[Eiger]

require(combinat)
permn((c(23,46,70,71,89))

Thanks.
When I try to install the "combinat" package, it give me these errors:
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--- Please select a CRAN mirror for use in this session ---
Warning in utils::install.packages(l[s + 1]) :
  argument 'lib' is missing: using '/usr/lib/R/lib'
Warning in utils::install.packages(l[s + 1]) :
  'lib = "/usr/lib/R/lib"' is not writable
Error in utils::install.packages(l[s + 1]) : unable to install packages
_________________________________________________________

What can I do?
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