zero bytes in boot partition during startup

What is output of

sudo fdisk -l

hi

dmt@dim-agg:~$ sudo fdisk -l
[sudo] password for dmt:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 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: 0x000b2a7a

   Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 156301311 77899777 5 Extended
/dev/sda5 501760 156301311 77899776 8e Linux LVM

Disk /dev/mapper/ubuntu--vg-root: 77.6 GB, 77628178432 bytes
255 heads, 63 sectors/track, 9437 cylinders, total 151617536 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--vg-root doesn't contain a valid partition table

Disk /dev/mapper/ubuntu--vg-swap_1: 2139 MB, 2139095040 bytes
255 heads, 63 sectors/track, 260 cylinders, total 4177920 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--vg-swap_1 doesn't contain a valid partition table

What is the output of:

uname -a;lsb_release -a; dpkg -l | grep linux-image | awk {'print $2'}

Thanks

Linux dim-agg 3.13.0-36-generic #63-Ubuntu SMP Wed Sep 3 21:30:45 UTC 2014 i686 i686 i686 GNU/Linux
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
linux-image-3.11.0-12-generic
linux-image-3.11.0-17-generic
linux-image-3.11.0-18-generic
linux-image-3.13.0-24-generic
linux-image-3.13.0-27-generic
linux-image-3.13.0-29-generic
linux-image-3.13.0-30-generic
linux-image-3.13.0-32-generic
linux-image-3.13.0-33-generic
linux-image-3.13.0-34-generic
linux-image-3.13.0-35-generic
linux-image-3.13.0-36-generic
linux-image-extra-3.11.0-12-generic
linux-image-extra-3.11.0-17-generic
linux-image-extra-3.11.0-18-generic
linux-image-extra-3.13.0-24-generic
linux-image-extra-3.13.0-27-generic
linux-image-extra-3.13.0-29-generic
linux-image-extra-3.13.0-30-generic
linux-image-extra-3.13.0-32-generic
linux-image-extra-3.13.0-33-generic
linux-image-extra-3.13.0-34-generic
linux-image-extra-3.13.0-35-generic
linux-image-extra-3.13.0-36-generic
linux-image-generic

thnks

sudo apt-get --purge remove linux-image-3.11*

sudo apt-get --purge remove linux-image-3.13.0-2*

sudo apt-get --purhe remove linux-image-3.13.0-30-generic

sudo apt-get --purhe remove linux-image-3.13.0-32-generic

sudo apt-get --purhe remove linux-image-3.13.0-33-generic

sudo apt-get --purhe remove linux-image-3.13.0-34-generic

sudo apt-get --purge autoremove

clear; df -h | ģrep boot

Is it ok now?

Hi i tried to run updater but it failed,then restarted the laptop and now it is in a cpu like screen (blue) which reads "memtest86 v4.20" and currently is in test #4, pass 19

If you hold SHIFT at boot, can you select the kernel as normal and boot?

i did and entered a purple screen ,ubuntu color,which reads
gnu grub v 2.03 beta2-9ubuntu1
under this there 2options : memory test(memtest86+) and memory test (memtest86+,serial console 115200)

It seems that you have mistyped one of the commands and have uninstalled ALL versions of the kernel, and not just the obsolete ones.

Repairing that is a bit tricky and requires booting into an Ubuntu live system. You need an Ubuntu installation kit on a bootable medium (either an installation DVD or a bootable USB stick with the Ubuntu installation kit on it).

http://askubuntu.com/questions/28099/how-to-restore-a-system-after-accidentally-removing-all-kernels has instructions what to do. If you have any question with executing the steps, please do not hesitate to ask.

i used the solution 21 but in the step 7 i got error
below the whole output

ubuntu@ubuntu:~$ sudo mount /dev/sdXY /mnt
mount: special device /dev/sdXY does not exist
ubuntu@ubuntu:~$ sudo parted -l
Model: ATA HTS541080G9SA00 (scsi)
Disk /dev/sda: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
 1 1049kB 256MB 255MB primary ext2 boot
 2 257MB 80.0GB 79.8GB extended
 5 257MB 80.0GB 79.8GB logical lvm

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/ubuntu--vg-swap_1: 2139MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
 1 0.00B 2139MB 2139MB linux-swap(v1)

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/ubuntu--vg-root: 77.6GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
 1 0.00B 77.6GB 77.6GB ext4

Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0
has been opened read-only.
Error: Can't have a partition outside the disk!

ubuntu@ubuntu:~$ sudo mount /dev/sda1 /mnt
mount: /dev/sda1 already mounted or /mnt busy
mount: according to mtab, /dev/sda1 is already mounted on /mnt
ubuntu@ubuntu:~$ sudo mount --bind /dev /mnt/dev
mount: mount point /mnt/dev does not exist
ubuntu@ubuntu:~$

I have no experience with that procedure in combination with logical volumes.

Maybe you have to use

sudo mount /dev/mapper/ubuntu--vg-root /mnt

and so on.

i finally decided to re install ubuntu. fortunately i had all my files saved in cloud storage and lost nothing

still as i guess the problem with the "stored" images that cut down boot space will reaear in the future
a. which is the solution
b. can i increase the boot volume so i have not so often this problem? during installation i did not find any partition option or smth relevant

Thanks Manfred Hampl, that solved my question.