Hit http://security.ubuntu.com trusty-security/universe Translation-en         
Hit http://in.archive.ubuntu.com trusty-backports/main i386 Packages           
Hit http://in.archive.ubuntu.com trusty-backports/restricted i386 Packages     
Hit http://in.archive.ubuntu.com trusty-backports/universe i386 Packages       
Hit http://in.archive.ubuntu.com trusty-backports/multiverse i386 Packages     
Hit http://in.archive.ubuntu.com trusty-backports/main Translation-en          
Hit http://in.archive.ubuntu.com trusty-backports/multiverse Translation-en    
Hit http://in.archive.ubuntu.com trusty-backports/restricted Translation-en    
Hit http://in.archive.ubuntu.com trusty-backports/universe Translation-en      
Ign http://in.archive.ubuntu.com trusty/main Translation-en_IN                 
Ign http://in.archive.ubuntu.com trusty/multiverse Translation-en_IN           
Ign http://in.archive.ubuntu.com trusty/restricted Translation-en_IN           
Ign http://in.archive.ubuntu.com trusty/universe Translation-en_IN             
Fetched 2,918 kB in 14s (204 kB/s)                                             
Reading package lists... Done
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Correcting dependencies... Done
The following packages were automatically installed and are no longer required:
  libav-tools libavdevice53 libavfilter3 libavresample1 libbs2b0 libctemplate2
  libgtkmm-2.4-1c2a liblua5.1-0 libmpg123-0 libpcrecpp0 libquvi-scripts
  libquvi7 libtinyxml2.6.2 libupstart1 libvdpau1 libzip2
  linux-headers-3.16.0-30 linux-headers-3.16.0-30-generic
  linux-image-3.16.0-30-generic linux-image-extra-3.16.0-30-generic mplayer2
  python-pysqlite2 rtmpdump
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  mysql-server-5.5
Suggested packages:
  tinyca mailx
The following NEW packages will be installed:
  mysql-server-5.5
0 upgraded, 1 newly installed, 0 to remove and 21 not upgraded.
1 not fully installed or removed.
Need to get 0 B/2,093 kB of archives.
After this operation, 32.7 MB of additional disk space will be used.
Do you want to continue? [Y/n] yes
Preconfiguring packages ...
(Reading database ... 290532 files and directories currently installed.)
Preparing to unpack .../mysql-server-5.5_5.5.43-0ubuntu0.14.04.1_amd64.deb ...
Aborting downgrade from (at least) 5.6 to 5.5.
If are sure you want to downgrade to 5.5, remove the file
/var/lib/mysql/debian-*.flag and try installing again.
dpkg: error processing archive /var/cache/apt/archives/mysql-server-5.5_5.5.43-0ubuntu0.14.04.1_amd64.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/mysql-server-5.5_5.5.43-0ubuntu0.14.04.1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)