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I want to be Linux administrator and I have not to much document and I was set up on ubuntu 17.10 on my laptop and always learning ubuntu but I need an Ubuntu document please give me ubuntu document book or link. THANKS!
There are lots of documentation sources - the first from Bruni is the wiki (help.ubuntu.com), another is the Ubuntu Manual project (ubuntu-manual.org) which is more user-oriented. Ubuntu 17.10 is a standard release with a supported life of only 9 months, which ended 2018-July-19 (see wiki.ubuntu.com/Releases which is from wiki). Ubuntu releases are in yy.mm in format, so 17.10 means 2017-October release (+9 = 2018-July). Long Term Support (or LTS) releases have a 5 year support - so you should install 18.04 LTS; or try do-release-upgrade to see the upgrade process quickly.
do-release-upgrade
to see the upgrade process quickly.