gistfile1.txt

$ sudo apt-get remove linux-image-3.5.0-23-generic linux-image-3.5.0-48-generic linux-image-3.5.0-49-generic linux-image-3.5.0-51-generic
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-3.5.0-48-generic linux-headers-3.5.0-49-generic python-greenlet linux-headers-3.5.0-48 linux-headers-3.5.0-49 python-gevent
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  linux-image-3.5.0-54-generic linux-image-generic-lts-quantal
Suggested packages:
  fdutils linux-lts-quantal-doc-3.5.0 linux-lts-quantal-source-3.5.0 linux-lts-quantal-tools linux-headers-3.5.0-54-generic
The following packages will be REMOVED:
  linux-image-3.5.0-23-generic linux-image-3.5.0-48-generic linux-image-3.5.0-49-generic linux-image-3.5.0-51-generic
The following NEW packages will be installed:
  linux-image-3.5.0-54-generic
The following packages will be upgraded:
  linux-image-generic-lts-quantal
1 upgraded, 1 newly installed, 4 to remove and 114 not upgraded.
Need to get 40.8 MB of archives.
After this operation, 471 MB disk space will be freed.
Do you want to continue [Y/n]?