Dear All,
I followed all instructions given step by step and tried to reinstall and got these errors 
> source('http://bioconductor.org/biocLite.R')
Bioconductor version 2.14 (BiocInstaller 1.14.2), ?biocLite
for help
> library(tools)
> library(utils)
> library(BiocInstaller)
> biocLite("SomaticSignatures")
BioC_mirror: http://bioconductor.org
Using Bioconductor version 2.14 (BiocInstaller 1.14.2), R
version
  3.1.0.
Installing package(s) 'SomaticSignatures'
also installing the dependencies ‘BiocParallel’,
‘GenomicFeatures’, ‘rtracklayer’, ‘biovizBase’, ‘GenomicAlignments’,
‘VariantAnnotation’, ‘ggbio’
 
trying URL
'http://bioconductor.org/packages/2.14/bioc/src/contrib/BiocParallel_0.6.0.tar.gz'
Content type 'application/x-gzip' length 296665 bytes (289
Kb)
opened URL
==================================================
downloaded 289 Kb
 
trying URL
'http://bioconductor.org/packages/2.14/bioc/src/contrib/GenomicFeatures_1.16.0.tar.gz'
Content type 'application/x-gzip' length 765601 bytes (747
Kb)
opened URL
==================================================
downloaded 747 Kb
 
trying URL
'http://bioconductor.org/packages/2.14/bioc/src/contrib/rtracklayer_1.24.0.tar.gz'
Content type 'application/x-gzip' length 1337513 bytes (1.3
Mb)
opened URL
==================================================
downloaded 1.3 Mb
 
trying URL
'http://bioconductor.org/packages/2.14/bioc/src/contrib/biovizBase_1.12.1.tar.gz'
Content type 'application/x-gzip' length 2429449 bytes (2.3
Mb)
opened URL
==================================================
downloaded 2.3 Mb
 
trying URL 'http://bioconductor.org/packages/2.14/bioc/src/contrib/GenomicAlignments_1.0.0.tar.gz'
Content type 'application/x-gzip' length 1935667 bytes (1.8
Mb)
opened URL
==================================================
downloaded 1.8 Mb
 
trying URL 'http://bioconductor.org/packages/2.14/bioc/src/contrib/VariantAnnotation_1.10.0.tar.gz'
Content type 'application/x-gzip' length 1300072 bytes (1.2
Mb)
opened URL
==================================================
downloaded 1.2 Mb
 
trying URL
'http://bioconductor.org/packages/2.14/bioc/src/contrib/ggbio_1.12.3.tar.gz'
Content type 'application/x-gzip' length 2471353 bytes (2.4
Mb)
opened URL
==================================================
downloaded 2.4 Mb
 
trying URL 'http://bioconductor.org/packages/2.14/bioc/src/contrib/SomaticSignatures_1.0.0.tar.gz'
Content type 'application/x-gzip' length 1007992 bytes (984
Kb)
opened URL
==================================================
downloaded 984 Kb
 
* installing *source* package ‘BiocParallel’ ...
** R
** inst
** preparing package for lazy loading
Error in readRDS(nsInfoFilePath) : error reading from
connection
ERROR: lazy loading failed for package ‘BiocParallel’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/BiocParallel’
ERROR: dependency ‘BiocParallel’ is not available for
package ‘GenomicAlignments’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/GenomicAlignments’
ERROR: dependency ‘GenomicAlignments’ is not available for
package ‘rtracklayer’
* removing ‘/home/asif/R/i686-pc-linux-gnu-library/3.1/rtracklayer’
ERROR: dependency ‘rtracklayer’ is not available for package
‘GenomicFeatures’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/GenomicFeatures’
ERROR: dependencies ‘GenomicFeatures’, ‘rtracklayer’ are not
available for package ‘VariantAnnotation’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/VariantAnnotation’
ERROR: dependencies ‘GenomicAlignments’, ‘GenomicFeatures’,
‘VariantAnnotation’ are not available for package ‘biovizBase’
* removing ‘/home/asif/R/i686-pc-linux-gnu-library/3.1/biovizBase’
ERROR: dependencies ‘biovizBase’, ‘GenomicFeatures’,
‘GenomicAlignments’, ‘VariantAnnotation’, ‘rtracklayer’ are not available for
package ‘ggbio’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/ggbio’
ERROR: dependencies ‘VariantAnnotation’, ‘ggbio’ are not
available for package ‘SomaticSignatures’
* removing
‘/home/asif/R/i686-pc-linux-gnu-library/3.1/SomaticSignatures’
 
The downloaded source packages are in
                ‘/tmp/RtmpoYsGgy/downloaded_packages’
Warning messages:
1: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘BiocParallel’ had non-zero exit status
2: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘GenomicAlignments’ had non-zero exit status
3: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘rtracklayer’ had non-zero exit status
4: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘GenomicFeatures’ had non-zero exit status
5: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘VariantAnnotation’ had non-zero exit status
6: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘biovizBase’ had non-zero exit status
7: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘ggbio’ had non-zero exit status
8: In install.packages(pkgs = pkgs, lib = lib, repos =
repos, ...) :
  installation of
package ‘SomaticSignatures’ had non-zero exit status
9: installed directory not writable, cannot update packages
'boot',
  'class', 'cluster',
'foreign', 'KernSmooth', 'lattice', 'MASS',
  'Matrix', 'mgcv',
'nlme', 'nnet', 'rpart', 'spatial'

Regards
>Huma
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