I was getting the following error during installation/accessing web interface of Gallery 3 under Debian squeeze
Gallery 3 requires a MySQL database, but PHP doesn’t have either the MySQL or the MySQLi extension.
You can try the following
#apt-get install php5-mysql
The command below
# apt-cache search Cache::Memcached::Fast
Showed no output. But the following command shows output
#apt-cache search Cache::Memcahced::Fast
libcache-memcached-fast-perl – Perl client for memcached, in C language
Spellings for Memcached are Memcahced. So unable to search.