Linux build kernel/boot space insufficient?

/boot space is generally allocated 100M space, is sufficient, due to frequent updates caused by the old no longer used kernel files are also retained in the boot space, occupy the location, so the unused kernel files to download the boot space can be released part of the practice as

1. Using dpkg--get-selections | grep Linux View the installation status of the kernel, usually with the image is the old kernel

2. Use Uname-a to view the current kernel version

3, generally before the current version of the version can be deleted, I am accustomed to the current version of the previous version of the retention

4. The removal instruction is the name of the sudo apt-get remove kernel file, such as Linux-image-3.2.0-33-generic-pae

5. To ensure that the uninstallation is clean, execute the sudo apt-get cleaning or sudo apt-get autoremove

Linux build kernel/boot space insufficient?