pdejean@app01.staging.us-east-1:/etc/apt/sources.list.d$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  linux-headers-generic linux-headers-virtual linux-image-virtual
  linux-virtual php5 php5-cli php5-common php5-curl php5-dev php5-fpm php5-gd
  php5-gmp php5-imap php5-json php5-mcrypt php5-mysql php5-pgsql php5-readline
  php5-sqlite php5-xsl
0 upgraded, 0 newly installed, 0 to remove and 20 not upgraded.
pdejean@app01.staging.us-east-1:/etc/apt/sources.list.d$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
  linux-headers-3.13.0-91 linux-headers-3.13.0-91-generic
  linux-image-3.13.0-91-generic
The following packages will be upgraded:
  linux-headers-generic linux-headers-virtual linux-image-virtual
  linux-virtual
4 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 24.8 MB of archives.
After this operation, 120 MB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.
pdejean@app01.staging.us-east-1:/etc/apt/sources.list.d$