[R] Cannot read or write to file in Linux Ubuntu

[John Kane]

I am the proud owner of a new laptop since my old one died the other day.
Currently I have a dual-boot Windows 7 Home and Ubuntu 12.04 .  I'll leave the Windows problems for another post.

 I know practically nothing about Linux so I am probably doing something stupid but ... at the moment I cannot seem read or write  files in Ubuntu.   I am not having any problem saving other documents to the hard drive and R , from my few simple tests, seems to be working okay otherwise.

At the moment I am trying :

mydata <- read.csv("DATA/media/DATA/rdata/tt1.csv",  header = TRUE)
  or 
mydata <- read.csv("DATA/rdata/tt1.csv",  header = TRUE)


where tt1.csv is a text file on what, from my reading of the path listed  in gedit is 
DATA/media/DATA/rdata

The csv data is simply:
aa, bb
2, 3
4, 5

What happens:
-------------------------------------------------------------------------------
1> mydata <- read.csv("DATA/rdata/tt1.csv",  header = TRUE)
Error in file(file, "rt") : cannot open the connection
In addition: Warning message:
In file(file, "rt") :
  cannot open file 'DATA/rdata/tt1.csv': No such file or directory

Am I totally screwing up the path?  Or doing something else equally stupid?

BTW I realise that 2.15 is out but Ubuntu as of yesterday did not have it in the repositories and I have yet to figure out how to install it from a CRAN site.

1> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: i686-pc-linux-gnu (32-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_CA.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

John Kane
Kingston ON Canada

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