Ubuntu 12.04 boot up is unreasonably slow

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http://askubuntu.com – One of the things I like about Ubuntu is the allegedly fast boot time, unfortunately that's not the case for me anymore. On my computer Ubuntu itself boots up in forty seconds (from choosing Ubuntu in the grub menu to reaching the login screen), and my user boots up in in almost fifty seconds (from entering my password to the appearance of the Dash). I want to note that although I never had fast boot-ups in Ubuntu, (the boot of Ubuntu itself was always slow), since the last upgrade things have just gotten worse. I also want to note that after the boot itself my Ubuntu runs quite smooth almos (HowTos)