Warnings

| Hmm,
| 
| another one, but error this time!
| 
| li> library(Matrix)
| Loading required package: lattice
| > round(1)
| Error in .Internal(round(x, digits)) : no internal function "round"

You may be getting caught between "partial" Ubuntu updates. I suspect that
you have 
	a) Ubuntu binaries for R 2.6.1 from CRAN -- 'current'
	b) r-cran-matrix from Ubuntu, not CRAN -- 'old'

On my (work) system, R is built locally [and equivalent to a) above as
Vincent uses the same build scripts] and Matrix is current from CRAN as I
just use R to update /usr/local/R/site-packages:

foo:~> dpkg -l | grep -ic ubuntu		## it really is Ubuntu
1120
foo:~> R

R version 2.6.1 (2007-11-26)
Copyright (C) 2007 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

library(Matrix)

Loading required package: lattice

round(1)

[1] 1

If my hunch is correct, just removed the r-cran-matrix package. Ubuntu is
behind the lightning speed of developement shown by the team of Drs Bates and
Maechler (Hi :)

Dirk

Three out of two people have difficulties with fractions.