extrem slow booting - ubuntu 12.04 64bit

view story

http://askubuntu.com – since installation of ubuntu precise I have problem with boot time: nearly 45min-60min. I have no idea whats wrong. My system is up to date. I have also bootchart installed but dont know to interprate the logs. One example is here: enter link description here There also other logs from bootchart but I dont understand them. Regards and thank you for help (HowTos)