arun @ arun-RD405-L-CDA1A2: ~ $ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
linux-generic linux-headers-generic linux-image-generic
The following packages will be upgraded:
flashplugin-installer google-chrome-stable grub-common grub-pc grub-pc-bin
grub2-common krb5-locales libgssapi-krb5-2 libido3-0.1-0 libk5crypto3
libkrb5-3 libkrb5support0 libnautilus-extension1a linux-firmware
linux-libc-dev nautilus nautilus-data notify-osd-icons unity-settings-daemon
unzip wpasupplicant
21 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
45 not fully installed or removed.
Need to get 0 B/78.0 MB of archives.
After this operation, 365 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Preconfiguring packages ...
dpkg: error: info database format (2) is bogus or too new; try getting a newer dpkg
E: Sub-process /usr/bin/dpkg returned an error code (2)