I don't understand what happened because i didn't change anything in system for quite a long time. Now system boots too slow and when it's booted - dns requests don't work. I can ping remote hosts by ip but can't request them by names. Here's what i've found in syslog
:
Dec 20 18:05:12 my-pc NetworkManager[1003]: <error> [1387548312.403516] [nm-dns-dnsmasq.c:402] update(): dnsmasq owner not found on bus: Could not get owner of name 'org.freedesktop.NetworkManager.dnsmasq': no such name
Dec 20 18:07:15 my-pc NetworkManager[2699]: <warn> failed to allocate link cache: (-10) Operation not supported
Dec 20 18:22:57 my-pc NetworkManager[2699]: <warn> DNS: plugin dnsmasq update failed
Also for some reason now I can mount usb flash drives only through console. I use Ubuntu 13.10.