I have this error because /boot partition full. Boot partition is becoming full on a regular basis. This is a fault. This should be a valid bug. Something should really be done about it. ~$ sudo ls -lR /boot /boot: total 205387 -rw-r--r-- 1 root root 852490 Apr 24 00:26 abi-3.5.0-28-generic -rw-r--r-- 1 root root 918917 May 14 23:42 abi-3.8.0-21-generic -rw-r--r-- 1 root root 919039 May 16 16:42 abi-3.8.0-22-generic -rw-r--r-- 1 root root 919039 May 29 21:48 abi-3.8.0-23-generic -rw-r--r-- 1 root root 919001 Jun 6 22:16 abi-3.8.0-25-generic -rw-r--r-- 1 root root 148096 Apr 24 00:26 config-3.5.0-28-generic -rw-r--r-- 1 root root 154942 May 14 23:42 config-3.8.0-21-generic -rw-r--r-- 1 root root 154943 May 16 16:42 config-3.8.0-22-generic -rw-r--r-- 1 root root 154943 May 29 21:48 config-3.8.0-23-generic -rw-r--r-- 1 root root 154943 Jun 6 22:16 config-3.8.0-25-generic drwxr-xr-x 5 root root 1024 Jun 19 17:03 grub -rw-r--r-- 1 root root 31680259 May 14 20:02 initrd.img-3.5.0-28-generic -rw-r--r-- 1 root root 32601101 May 16 09:37 initrd.img-3.8.0-21-generic -rw-r--r-- 1 root root 32600001 May 24 10:03 initrd.img-3.8.0-22-generic -rw-r--r-- 1 root root 32600725 Jun 4 14:04 initrd.img-3.8.0-23-generic -rw-r--r-- 1 root root 32601461 Jun 19 17:03 initrd.img-3.8.0-25-generic drwxr-xr-x 2 root root 12288 Nov 28 2012 lost+found -rw-r--r-- 1 root root 176764 Dec 5 2012 memtest86+.bin -rw-r--r-- 1 root root 178944 Dec 5 2012 memtest86+_multiboot.bin -rw------- 1 root root 2901505 Apr 24 00:26 System.map-3.5.0-28-generic -rw------- 1 root root 3060094 May 14 23:42 System.map-3.8.0-21-generic -rw------- 1 root root 3060454 May 16 16:42 System.map-3.8.0-22-generic -rw------- 1 root root 3060454 May 29 21:48 System.map-3.8.0-23-generic -rw------- 1 root root 3060761 Jun 6 22:16 System.map-3.8.0-25-generic -rw------- 1 root root 5130128 Apr 24 00:26 vmlinuz-3.5.0-28-generic -rw------- 1 root root 5356592 May 14 23:42 vmlinuz-3.8.0-21-generic -rw------- 1 root root 5356688 May 16 16:42 vmlinuz-3.8.0-22-generic -rw------- 1 root root 5356656 May 29 21:48 vmlinuz-3.8.0-23-generic -rw------- 1 root root 5357392 Jun 6 22:16 vmlinuz-3.8.0-25-generic /boot/grub: total 2209 drwxr-xr-x 2 root root 1024 Nov 28 2012 fonts -rw-r--r-- 1 root root 699 Oct 17 2012 gfxblacklist.txt -r--r--r-- 1 root root 13641 Jun 19 17:03 grub.cfg -rw-r--r-- 1 root root 1024 Jun 29 19:22 grubenv drwxr-xr-x 2 root root 5120 May 14 20:21 i386-pc drwxr-xr-x 2 root root 1024 Nov 28 2012 locale -rw-r--r-- 1 root root 2226340 May 14 20:21 unicode.pf2 /boot/grub/fonts: total 2185 -rw-r--r-- 1 root root 2226340 May 14 20:21 unicode.pf2 /boot/grub/i386-pc: total 1773 -rw-r--r-- 1 root root 7456 May 14 20:21 915resolution.mod -rw-r--r-- 1 root root 10024 May 14 20:21 acpi.mod -rw-r--r-- 1 root root 1308 May 14 20:21 adler32.mod -rw-r--r-- 1 root root 5668 May 14 20:21 affs.mod -rw-r--r-- 1 root root 6876 May 14 20:21 afs.mod -rw-r--r-- 1 root root 8652 May 14 20:21 ahci.mod -rw-r--r-- 1 root root 705 May 14 20:21 all_video.mod -rw-r--r-- 1 root root 1048 May 14 20:21 aout.mod -rw-r--r-- 1 root root 5436 May 14 20:21 ata.mod -rw-r--r-- 1 root root 4012 May 14 20:21 at_keyboard.mod -rw-r--r-- 1 root root 1632 May 14 20:21 backtrace.mod -rw-r--r-- 1 root root 7644 May 14 20:21 bfs.mod -rw-r--r-- 1 root root 4664 May 14 20:21 biosdisk.mod -rw-r--r-- 1 root root 2376 May 14 20:21 bitmap.mod -rw-r--r-- 1 root root 2908 May 14 20:21 bitmap_scale.mod -rw-r--r-- 1 root root 2076 May 14 20:21 blocklist.mod -rw-r--r-- 1 root root 512 May 14 20:21 boot.img -rw-r--r-- 1 root root 2460 May 14 20:21 boot.mod -rw-r--r-- 1 root root 30084 May 14 20:21 bsd.mod -rw-r--r-- 1 root root 14344 May 14 20:21 btrfs.mod -rw-r--r-- 1 root root 2156 May 14 20:21 bufio.mod -rw-r--r-- 1 root root 2236 May 14 20:21 cat.mod -rw-r--r-- 1 root root 512 May 14 20:21 cdboot.img -rw-r--r-- 1 root root 3504 May 14 20:21 chain.mod -rw-r--r-- 1 root root 1540 May 14 20:21 cmostest.mod -rw-r--r-- 1 root root 1984 May 14 20:21 cmp.mod -rw-r--r-- 1 root root 3251 May 14 20:21 command.lst -rw-r--r-- 1 root root 2212 May 14 20:21 configfile.mod -rw-r--r-- 1 root root 26385 May 14 20:21 core.img -rw-r--r-- 1 root root 4468 May 14 20:21 cpio_be.mod -rw-r--r-- 1 root root 4372 May 14 20:21 cpio.mod -rw-r--r-- 1 root root 1544 May 14 20:21 cpuid.mod -rw-r--r-- 1 root root 1672 May 14 20:21 crc64.mod -rw-r--r-- 1 root root 8632 May 14 20:21 cryptodisk.mod -rw-r--r-- 1 root root 855 May 14 20:21 crypto.lst -rw-r--r-- 1 root root 4368 May 14 20:21 crypto.mod -rw-r--r-- 1 root root 3904 May 14 20:21 cs5536.mod -rw-r--r-- 1 root root 1788 May 14 20:21 datehook.mod -rw-r--r-- 1 root root 2172 May 14 20:21 date.mod -rw-r--r-- 1 root root 1281 May 14 20:21 datetime.mod -rw-r--r-- 1 root root 512 May 14 20:21 diskboot.img -rw-r--r-- 1 root root 9660 May 14 20:21 diskfilter.mod -rw-r--r-- 1 root root 1828 May 14 20:21 dm_nv.mod -rw-r--r-- 1 root root 5400 May 14 20:21 drivemap.mod -rw-r--r-- 1 root root 1984 May 14 20:21 echo.mod -rw-r--r-- 1 root root 7424 May 14 20:21 efiemu32.o -rw-r--r-- 1 root root 11313 May 14 20:21 efiemu64.o -rw-r--r-- 1 root root 23968 May 14 20:21 efiemu.mod -rw-r--r-- 1 root root 15640 May 14 20:21 ehci.mod -rw-r--r-- 1 root root 4424 May 14 20:21 elf.mod -rw-r--r-- 1 root root 5288 May 14 20:21 exfat.mod -rw-r--r-- 1 root root 1468 May 14 20:21 exfctest.mod -rw-r--r-- 1 root root 5680 May 14 20:21 ext2.mod -rw-r--r-- 1 root root 4500 May 14 20:21 extcmd.mod -rw-r--r-- 1 root root 5596 May 14 20:21 fat.mod -rw-r--r-- 1 root root 12168 May 14 20:21 font.mod -rw-r--r-- 1 root root 2212 May 14 20:21 freedos.mod -rw-r--r-- 1 root root 2832 May 14 20:21 fshelp.mod -rw-r--r-- 1 root root 194 May 14 20:21 fs.lst -rw-r--r-- 1 root root 2764 May 14 20:21 functional_test.mod -rw-r--r-- 1 root root 512 May 14 20:21 g2hdr.img -rw-r--r-- 1 root root 1612 May 14 20:21 gcry_arcfour.mod -rw-r--r-- 1 root root 8092 May 14 20:21 gcry_blowfish.mod -rw-r--r-- 1 root root 34124 May 14 20:21 gcry_camellia.mod -rw-r--r-- 1 root root 16832 May 14 20:21 gcry_cast5.mod -rw-r--r-- 1 root root 2916 May 14 20:21 gcry_crc.mod -rw-r--r-- 1 root root 19312 May 14 20:21 gcry_des.mod -rw-r--r-- 1 root root 3128 May 14 20:21 gcry_md4.mod -rw-r--r-- 1 root root 3764 May 14 20:21 gcry_md5.mod -rw-r--r-- 1 root root 2496 May 14 20:21 gcry_rfc2268.mod -rw-r--r-- 1 root root 18936 May 14 20:21 gcry_rijndael.mod -rw-r--r-- 1 root root 8108 May 14 20:21 gcry_rmd160.mod -rw-r--r-- 1 root root 15632 May 14 20:21 gcry_seed.mod -rw-r--r-- 1 root root 16148 May 14 20:21 gcry_serpent.mod -rw-r--r-- 1 root root 7460 May 14 20:21 gcry_sha1.mod -rw-r--r-- 1 root root 3508 May 14 20:21 gcry_sha256.mod -rw-r--r-- 1 root root 5764 May 14 20:21 gcry_sha512.mod -rw-r--r-- 1 root root 11684 May 14 20:21 gcry_tiger.mod -rw-r--r-- 1 root root 39372 May 14 20:21 gcry_twofish.mod -rw-r--r-- 1 root root 24480 May 14 20:21 gcry_whirlpool.mod -rw-r--r-- 1 root root 25700 May 14 20:21 gdb.mod -rw-r--r-- 1 root root 5900 May 14 20:21 geli.mod -rw-r--r-- 1 root root 4744 May 14 20:21 gettext.mod -rw-r--r-- 1 root root 33208 May 14 20:21 gfxmenu.mod -rw-r--r-- 1 root root 11944 May 14 20:21 gfxterm.mod -rw-r--r-- 1 root root 3684 May 14 20:21 gptsync.mod -rw-r--r-- 1 root root 10240 May 14 20:21 grldr.img -rw-r--r-- 1 root root 7928 May 14 20:21 gzio.mod -rw-r--r-- 1 root root 4412 May 14 20:21 halt.mod -rw-r--r-- 1 root root 5008 May 14 20:21 hashsum.mod -rw-r--r-- 1 root root 7212 May 14 20:21 hdparm.mod -rw-r--r-- 1 root root 1204 May 14 20:21 hello.mod -rw-r--r-- 1 root root 2552 May 14 20:21 help.mod -rw-r--r-- 1 root root 3168 May 14 20:21 hexdump.mod -rw-r--r-- 1 root root 7212 May 14 20:21 hfs.mod -rw-r--r-- 1 root root 6580 May 14 20:21 hfsplus.mod -rw-r--r-- 1 root root 5532 May 14 20:21 http.mod -rw-r--r-- 1 root root 47560 May 14 20:21 hwmatch.mod -rw-r--r-- 1 root root 2836 May 14 20:21 iorw.mod -rw-r--r-- 1 root root 8796 May 14 20:21 iso9660.mod -rw-r--r-- 1 root root 6556 May 14 20:21 jfs.mod -rw-r--r-- 1 root root 6024 May 14 20:21 jpeg.mod -rw-r--r-- 1 root root 28784 May 14 20:21 kernel.img -rw-r--r-- 1 root root 4484 May 14 20:21 keylayouts.mod -rw-r--r-- 1 root root 1948 May 14 20:21 keystatus.mod -rw-r--r-- 1 root root 6772 May 14 20:21 ldm.mod -rw-r--r-- 1 root root 28364 May 14 20:21 legacycfg.mod -rw-r--r-- 1 root root 5976 May 14 20:21 linux16.mod -rw-r--r-- 1 root root 11516 May 14 20:21 linux.mod -rw-r--r-- 1 root root 1024 May 14 20:21 lnxboot.img -rw-r--r-- 1 root root 5568 May 14 20:21 loadenv.mod -rw-r--r-- 1 root root 2860 May 14 20:21 loopback.mod -rw-r--r-- 1 root root 3600 May 14 20:21 lsacpi.mod -rw-r--r-- 1 root root 2280 May 14 20:21 lsapm.mod -rw-r--r-- 1 root root 1796 May 14 20:21 lsmmap.mod -rw-r--r-- 1 root root 4320 May 14 20:21 ls.mod -rw-r--r-- 1 root root 4808 May 14 20:21 lspci.mod -rw-r--r-- 1 root root 6492 May 14 20:21 luks.mod -rw-r--r-- 1 root root 6612 May 14 20:21 lvm.mod -rw-r--r-- 1 root root 2848 May 14 20:21 lzma_decompress.img -rw-r--r-- 1 root root 8708 May 14 20:21 lzopio.mod -rw-r--r-- 1 root root 1976 May 14 20:21 mdraid09_be.mod -rw-r--r-- 1 root root 1912 May 14 20:21 mdraid09.mod -rw-r--r-- 1 root root 1964 May 14 20:21 mdraid1x.mod -rw-r--r-- 1 root root 2012 May 14 20:21 memdisk.mod -rw-r--r-- 1 root root 2836 May 14 20:21 memrw.mod -rw-r--r-- 1 root root 3440 May 14 20:21 minicmd.mod -rw-r--r-- 1 root root 3912 May 14 20:21 minix2_be.mod -rw-r--r-- 1 root root 3820 May 14 20:21 minix2.mod -rw-r--r-- 1 root root 3872 May 14 20:21 minix3_be.mod -rw-r--r-- 1 root root 3780 May 14 20:21 minix3.mod -rw-r--r-- 1 root root 3840 May 14 20:21 minix_be.mod -rw-r--r-- 1 root root 3744 May 14 20:21 minix.mod -rw-r--r-- 1 root root 8804 May 14 20:21 mmap.mod -rw-r--r-- 1 root root 3973 May 14 20:21 moddep.lst -rw-r--r-- 1 root root 2392 May 14 20:21 msdospart.mod -rw-r--r-- 1 root root 12740 May 14 20:21 multiboot2.mod -rw-r--r-- 1 root root 12312 May 14 20:21 multiboot.mod -rw-r--r-- 1 root root 43816 May 14 20:21 net.mod -rw-r--r-- 1 root root 4636 May 14 20:21 newc.mod -rw-r--r-- 1 root root 6596 May 14 20:21 nilfs2.mod -rw-r--r-- 1 root root 110256 May 14 20:21 normal.mod -rw-r--r-- 1 root root 3420 May 14 20:21 ntfscomp.mod -rw-r--r-- 1 root root 10152 May 14 20:21 ntfs.mod -rw-r--r-- 1 root root 2556 May 14 20:21 ntldr.mod -rw-r--r-- 1 root root 4464 May 14 20:21 odc.mod -rw-r--r-- 1 root root 10332 May 14 20:21 ohci.mod -rw-r--r-- 1 root root 1632 May 14 20:21 part_acorn.mod -rw-r--r-- 1 root root 1796 May 14 20:21 part_amiga.mod -rw-r--r-- 1 root root 2064 May 14 20:21 part_apple.mod -rw-r--r-- 1 root root 2748 May 14 20:21 part_bsd.mod -rw-r--r-- 1 root root 1456 May 14 20:21 part_dvh.mod -rw-r--r-- 1 root root 2368 May 14 20:21 part_gpt.mod -rw-r--r-- 1 root root 101 May 14 20:21 partmap.lst -rw-r--r-- 1 root root 2352 May 14 20:21 part_msdos.mod -rw-r--r-- 1 root root 1808 May 14 20:21 part_plan.mod -rw-r--r-- 1 root root 1500 May 14 20:21 part_sun.mod -rw-r--r-- 1 root root 1608 May 14 20:21 part_sunpc.mod -rw-r--r-- 1 root root 17 May 14 20:21 parttool.lst -rw-r--r-- 1 root root 4604 May 14 20:21 parttool.mod -rw-r--r-- 1 root root 1896 May 14 20:21 password.mod -rw-r--r-- 1 root root 2796 May 14 20:21 password_pbkdf2.mod -rw-r--r-- 1 root root 4676 May 14 20:21 pata.mod -rw-r--r-- 1 root root 1336 May 14 20:21 pbkdf2.mod -rw-r--r-- 1 root root 1428 May 14 20:21 pci.mod -rw-r--r-- 1 root root 6296 May 14 20:21 plan9.mod -rw-r--r-- 1 root root 2428 May 14 20:21 play.mod -rw-r--r-- 1 root root 6456 May 14 20:21 png.mod -rw-r--r-- 1 root root 1556 May 14 20:21 priority_queue.mod -rw-r--r-- 1 root root 2584 May 14 20:21 probe.mod -rw-r--r-- 1 root root 1024 May 14 20:21 pxeboot.img -rw-r--r-- 1 root root 2696 May 14 20:21 pxechain.mod -rw-r--r-- 1 root root 3824 May 14 20:21 pxe.mod -rw-r--r-- 1 root root 1404 May 14 20:21 raid5rec.mod -rw-r--r-- 1 root root 2168 May 14 20:21 raid6rec.mod -rw-r--r-- 1 root root 1492 May 14 20:21 read.mod -rw-r--r-- 1 root root 1716 May 14 20:21 reboot.mod -rw-r--r-- 1 root root 51540 May 14 20:21 regexp.mod -rw-r--r-- 1 root root 8956 May 14 20:21 reiserfs.mod -rw-r--r-- 1 root root 15052 May 14 20:21 relocator.mod -rw-r--r-- 1 root root 4052 May 14 20:21 romfs.mod -rw-r--r-- 1 root root 5068 May 14 20:21 scsi.mod -rw-r--r-- 1 root root 3304 May 14 20:21 search_fs_file.mod -rw-r--r-- 1 root root 3276 May 14 20:21 search_fs_uuid.mod -rw-r--r-- 1 root root 3208 May 14 20:21 search_label.mod -rw-r--r-- 1 root root 3664 May 14 20:21 search.mod -rw-r--r-- 1 root root 7080 May 14 20:21 sendkey.mod -rw-r--r-- 1 root root 7104 May 14 20:21 serial.mod -rw-r--r-- 1 root root 706 May 14 20:21 setjmp.mod -rw-r--r-- 1 root root 5376 May 14 20:21 setpci.mod -rw-r--r-- 1 root root 5068 May 14 20:21 sfs.mod -rw-r--r-- 1 root root 2256 May 14 20:21 sleep.mod -rw-r--r-- 1 root root 6828 May 14 20:21 squash4.mod -rw-r--r-- 1 root root 5108 May 14 20:21 tar.mod -rw-r--r-- 1 root root 132 May 14 20:21 terminal.lst -rw-r--r-- 1 root root 4324 May 14 20:21 terminal.mod -rw-r--r-- 1 root root 11192 May 14 20:21 terminfo.mod -rw-r--r-- 1 root root 1340 May 14 20:21 test_blockarg.mod -rw-r--r-- 1 root root 2656 May 14 20:21 testload.mod -rw-r--r-- 1 root root 4944 May 14 20:21 test.mod -rw-r--r-- 1 root root 5232 May 14 20:21 tftp.mod -rw-r--r-- 1 root root 2748 May 14 20:21 tga.mod -rw-r--r-- 1 root root 1508 May 14 20:21 time.mod -rw-r--r-- 1 root root 1691 May 14 20:21 trig.mod -rw-r--r-- 1 root root 1204 May 14 20:21 true.mod -rw-r--r-- 1 root root 7624 May 14 20:21 udf.mod -rw-r--r-- 1 root root 5448 May 14 20:21 ufs1.mod -rw-r--r-- 1 root root 5532 May 14 20:21 ufs2.mod -rw-r--r-- 1 root root 6452 May 14 20:21 uhci.mod -rw-r--r-- 1 root root 3932 May 14 20:21 usb_keyboard.mod -rw-r--r-- 1 root root 9816 May 14 20:21 usb.mod -rw-r--r-- 1 root root 7180 May 14 20:21 usbms.mod -rw-r--r-- 1 root root 1984 May 14 20:21 usbserial_common.mod -rw-r--r-- 1 root root 2332 May 14 20:21 usbserial_ftdi.mod -rw-r--r-- 1 root root 2684 May 14 20:21 usbserial_pl2303.mod -rw-r--r-- 1 root root 3604 May 14 20:21 usbtest.mod -rw-r--r-- 1 root root 9632 May 14 20:21 vbe.mod -rw-r--r-- 1 root root 4568 May 14 20:21 vga.mod -rw-r--r-- 1 root root 2160 May 14 20:21 vga_text.mod -rw-r--r-- 1 root root 5368 May 14 20:21 video_bochs.mod -rw-r--r-- 1 root root 5712 May 14 20:21 video_cirrus.mod -rw-r--r-- 1 root root 20148 May 14 20:21 video_fb.mod -rw-r--r-- 1 root root 4076 May 14 20:21 videoinfo.mod -rw-r--r-- 1 root root 33 May 14 20:21 video.lst -rw-r--r-- 1 root root 10448 May 14 20:21 video.mod -rw-r--r-- 1 root root 4140 May 14 20:21 videotest.mod -rw-r--r-- 1 root root 6008 May 14 20:21 xfs.mod -rw-r--r-- 1 root root 33224 May 14 20:21 xnu.mod -rw-r--r-- 1 root root 2008 May 14 20:21 xnu_uuid.mod -rw-r--r-- 1 root root 14884 May 14 20:21 xzio.mod -rw-r--r-- 1 root root 5452 May 14 20:21 zfscrypt.mod -rw-r--r-- 1 root root 6392 May 14 20:21 zfsinfo.mod -rw-r--r-- 1 root root 36536 May 14 20:21 zfs.mod /boot/grub/locale: total 6 -rw-r--r-- 1 root root 866 May 14 20:21 en_AU.mo -rw-r--r-- 1 root root 466 May 14 20:21 en_CA.mo -rw-r--r-- 1 root root 3531 May 14 20:21 en_GB.mo /boot/lost+found: total 0