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Replace the first part of the command above with the appropriate timezone string. Eg: 'Europe/London' or for UTC - 'Etc/UTC'. The appropriate string can be found from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
This is useful when your server is installed by a data centre (managed hardware, VPS, etc) and the timezone is not usually set to the one your prefer.
Like 7172, but much easier.
I used this to mass install a lot of perl stuff. Threw it together because I was feeling *especially* lazy. The 'perl' and the 'module' can be replaced with whatever you like.
search ubuntu's remote package source repositories for a specific program to see which package contains it