I am getting these errors during sudo apt-get update and upgrade... I tried all possible options no success. I recently upgraded to 13.04 and had problems with Broadcom WiFi. Fixed tat issues using the clean script... but looks like it did not install the Kernel properly.. Here is the o/p of the few scripts I ran:

ashesh@ashesh-HPdv4:~$ sudo dpkg -r bcmwl-kernel-source
(Reading database ... 175338 files and directories currently installed.)
Removing bcmwl-kernel-source ...
Removing all DKMS Modules
Done.
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-3.8.0-25-generic
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/mtd/mtd.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/mtd/mtd.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/sfc/sfc.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/sfc/sfc.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/mellanox/mlx4/mlx4_core.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/mellanox/mlx4/mlx4_core.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/broadcom/bnx2x/bnx2x.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/broadcom/bnx2x/bnx2x.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/broadcom/cnic.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/broadcom/cnic.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/qlogic/netxen/netxen_nic.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/qlogic/netxen/netxen_nic.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/brocade/bna/bna.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/net/ethernet/brocade/bna/bna.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/scsi/libfc/libfc.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/scsi/libfc/libfc.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/scsi/advansys.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/scsi/advansys.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/scsi/be2iscsi/be2iscsi.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/scsi/be2iscsi/be2iscsi.ko’: Input/output error
cp: reading ‘/lib/modules/3.8.0-25-generic/kernel/drivers/scsi/bnx2i/bnx2i.ko’: Input/output error
cp: failed to extend ‘/tmp/mkinitramfs_8gjKwQ//lib/modules/3.8.0-25-generic/kernel/drivers/scsi/bnx2i/bnx2i.ko’: Input/output error
Bus error (core dumped)
depmod: ../libkmod/libkmod-elf.c:207: elf_get_mem: Assertion `offset < elf->size' failed.

Aborted (core dumped)

I am not a techie but I need your support to resolve this without re-installation from scratch....