LinkChecker is a free, GPL licensed website validator. LinkChecker checks links in web documents or full websites.
recursive and multithreaded checking and site crawling
output in colored or normal text, HTML, SQL, CSV, XML or a sitemap graph in different formats
HTTP/1.1, HTTPS, FTP, mailto:, news:, nntp:, Telnet and local file links support
restriction of link checking with regular expression filters for URLs
username/password authorization for HTTP and FTP and Telnet
honors robots.txt exclusion protocol
HTML and CSS syntax check
Different interfaces: command line, GUI and web interface
Install LinkChecker in ubuntu
First you need to download linkchecker-gui .deb package from here once you have deb package you install by double clicking on it.