R lapack routines cannot be loaded

I usually ran different statistical analysis in R with routines that
use lapack like gam() lm(), etc but after several updates of libraries
the following error appears:

library(mgcv)
This is mgcv 1.7-22. For overview type 'help("mgcv-package")'.

model <- with(chlaR,gam(ClorMAX ~ s(DegDay_NM)))
Error en eigen(St, symmetric = TRUE) :
lapack routines  cannot be loaded
Adem?s: Mensajes de aviso perdidos
In eigen(St, symmetric = TRUE) :
   unable to load shared object '/usr/lib/R/modules//lapack.so':
   /usr/lib/R/modules//lapack.so: undefined symbol: dpstrf_

model <- with(chlaR,lm(ClorMAX ~ DegDay_NM))
summary(model)
Error en chol2inv(Qr$qr[p1, p1, drop = FALSE]) :
   lapack routines  cannot be loaded

The version information is:

platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 2
minor 15.2
year 2012
month 10
day 26
svn rev 61015
language R

I am using Ubuntu 12.04.1 LTS

Any ideas?