/boot has become 100% full somehow.

df -k

Filesystem              1K-blocks     Used Available Use% Mounted on

/dev/mapper/ubuntu-root 191078052 31758960 149612804  18% /

udev                      3997520        8   3997512   1% /dev

tmpfs                     1602244      856   1601388   1% /run

none                         5120        0      5120   0% /run/lock

none                      4005600     1792   4003808   1% /run/shm

none                       102400       28    102372   1% /run/user

/dev/sda1                  233191   218740      2010 100% /boot





mount

/dev/mapper/ubuntu-root on / type ext4 (rw,errors=remount-ro)

proc on /proc type proc (rw,noexec,nosuid,nodev)

sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)

none on /sys/fs/fuse/connections type fusectl (rw)

none on /sys/kernel/debug type debugfs (rw)

none on /sys/kernel/security type securityfs (rw)

udev on /dev type devtmpfs (rw,mode=0755)

devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)

tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)

none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)

none on /run/shm type tmpfs (rw,nosuid,nodev)

none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)

/dev/sda1 on /boot type ext2 (rw)

binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)

vmware-vmblock on /run/vmblock-fuse type fuse.vmware-vmblock (rw,nosuid,nodev,default_permissions,allow_other)

gvfsd-fuse on /run/user/foo/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=foo)

How can I make the space allocated to /boot bigger?

There is a related question How do I free up more space in /boot? but that is not what I want to do.

Added.

Disk /dev/sda: 200.0 GB, 200049647616 bytes

255 heads, 63 sectors/track, 24321 cylinders, total 390721968 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x0007f9dc



   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048      499711      248832   83  Linux

/dev/sda2          501758   390721535   195109889    5  Extended

/dev/sda5          501760   390721535   195109888   8e  Linux LVM



Disk /dev/mapper/ubuntu-root: 198.8 GB, 198784843776 bytes

255 heads, 63 sectors/track, 24167 cylinders, total 388251648 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/ubuntu-root doesn't contain a valid partition table



Disk /dev/mapper/ubuntu-swap_1: 1006 MB, 1006632960 bytes

255 heads, 63 sectors/track, 122 cylinders, total 1966080 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000



Disk /dev/mapper/ubuntu-swap_1 doesn't contain a valid partition table