openjdk version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea 2.3.3) (7u9-2.3.3-1ubuntu0.12.04.2)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)
I tried apt-get clean and then apt-get update again and I got the same error when trying to download some packages.
I tried running sudo apt-get update and sudo apt-get upgrade and that was successful.
I do have the internet and the file system on that machine is not locked.
I have the same error when using the terminal and command line as well.
A:
The solution for this error is to completely reinstall the nginx package and the related dependencies.
sudo apt-get remove nginx
sudo apt-get autoremove
sudo apt-get install nginx
sudo apt-get install -f
sudo dpkg --configure -a
sudo apt-get -f install
Q:
In R shiny, how to disable submit button when all input data is empty?
In the code below, how to disable the submit button when all input data is empty?  
#ui.R
library(shiny)
shinyUI(fluidPage(
  titlePanel("Testing"),
  sidebarLayout(
    sidebarPanel(
      h5("Select an option"),
      selectInput("choice", "Select an option", choices = NULL, selected = NULL),
      br(),
      actionButton("goButton", "Submit!")
    ),
    mainPanel()
  )
))
#server.R
shinyServer(function(input, output) {
  output$goButton 3125841983

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