title: Unable to Install Plotly
body: <p>I am trying to install plotly library in my shiny server(Ubuntu 14.04). I am using <code>devtools</code> to install <code>plotly</code>.</p>
  
  <pre><code>devtools::install_github("ropensci/plotly")
  </code></pre>
  
  <p>I am observing the following:</p>
  
  <pre><code>Downloading GitHub repo ropensci/plotly@master
  from URL https://api.github.com/repos/ropensci/plotly/zipball/master
  Installing plotly
  Skipping 3 unavailable packages: ggplot2, plyr, tidyr
  Installing 1 package: viridis
  Installing package into â/home/shiny/R/x86_64-pc-linux-gnu-library/3.0â
  (as âlibâ is unspecified)
  trying URL 'http://cran.rstudio.com/src/contrib/viridis_0.3.4.tar.gz'
  Content type 'application/x-gzip' length 1764427 bytes (1.7 Mb)
  
  opened URL
  
  downloaded 1.7 Mb
  
  * installing *source* package âviridisâ ...
  ** package âviridisâ successfully unpacked and MD5 sums checked
  ** R
  ** data
  *** moving datasets to lazyload DB
  ** inst
  ** preparing package for lazy loading
  Error in loadNamespace(j &lt;- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) :
    namespace âggplot2â 0.9.3.1 is being loaded, but &gt;= 1.0.1 is required
  ERROR: lazy loading failed for package âviridisâ
  * removing â/home/shiny/R/x86_64-pc-linux-gnu-library/3.0/viridisâ
  
  The downloaded source packages are in
          â/tmp/RtmpNULrLF/downloaded_packagesâ
  '/usr/lib/R/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet  \
    CMD INSTALL '/tmp/RtmpNULrLF/devtools59af4cc18d9c/ropensci-plotly-d2e5adf'  \
    --library='/home/shiny/R/x86_64-pc-linux-gnu-library/3.0' --install-tests
  
  
  ERROR: dependencies âviridisâ, âtidyrâ are not available for package âplotlyâ
  * removing â/home/shiny/R/x86_64-pc-linux-gnu-library/3.0/plotlyâ
  Error: Command failed (1)
  In addition: Warning message:
  In utils::install.packages(pkgs, repos = repos, type = type, dependencies = dependencies,  :
    installation of package âviridisâ had non-zero exit status
  </code></pre>
  
  <p>I am also trying <code>install.packages("plotly")</code> and I am hitting the error.</p>
  
  <pre><code>Warning messages:
  1: In install.packages("plotly") :
    installation of package âviridisâ had non-zero exit status
  2: In install.packages("plotly") :
    installation of package âplotlyâ had non-zero exit status
  </code></pre>
  
  <p>Can someone help with the error?</p>