I tried Refresh Available Packages command too but got same result. This is the log for apache fail. there are 130 packages to update. :(
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
apache2-bin apache2-data
Suggested packages:
ufw
The following packages will be upgraded:
apache2 apache2-bin apache2-data
3 upgraded, 0 newly installed, 0 to remove and 127 not upgraded.
Need to get 1069 kB of archives.
After this operation, 0 B of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
apache2 apache2-bin apache2-data
E: There are problems and -y was used without --force-yes
Well I got it sorted out after doing
$ sudo apt-key update $ sudo apt-get update