precise
12.04 LTS
trusty
14.04 LTS
wily
15.10
xenial
16.04 LTS
yakkety
16.10
zesty
17.04
Section Description
man(1), man(1)man(1), man(1)man(1), man(1)man(1), man(1)man(1), man(1)man(1), man(1)(1) - Executable programs or shell commands
......(2) - System calls (functions provided by the kernel)
......(3) - Library calls (functions within program libraries)
......(4) - Special files (usually found in /dev)
......(5) - File formats and conventions eg /etc/passwd
......(6) - Games
man(7)man(7)man(7)man(7)man(7)man(7)(7) - Miscellaneous (including macro packages and conventions)
......(8) - System administration commands (usually only for root)