There is probably bug - after trying some themes from themes menu and upgrading everything suddenly out of blue fonts size at both sidebars appeared bigger and everything underlined. Nothing helped even after changing to default style. Im not 100% sure that it was reason but something spoiled css style at sidebars.
After this i tried uninstall and install xwiki again. What was my big suprise when after initialization i saw again the same settings which i set up before - it remember somehow. So next time during apt purging i checked if xwiki mysql database was indeed deleted, deleted manually /etc/xwiki and every folder in system which had something to do with xwiki name.I even removed tomcat. Reinstaled xwiki and suprise… it still remember past settings.
My question is:
How to purge xwiki installation…i would like try another fresh install and give it one more chance.