[R] package update

[eric]

I tried to update my packages using update.packages() 

I got the following message:

The downloaded packages are in
	‘/tmp/RtmpyDYdTX/downloaded_packages’
Warning in install.packages(update[instlib == l, "Package"], l, contriburl =
contriburl,  :
  'lib = "/usr/lib/R/library"' is not writable
Error in install.packages(update[instlib == l, "Package"], l, contriburl =
contriburl,  : 
  unable to install package

How do I fix this ?

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