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My ubuntu 12.04 takes around 2 minutes to boot up. Here's the dmesg log:

[    5.604034] xor: using function: pIII_sse (5076.000 MB/sec)
[    5.605626] device-mapper: dm-raid45: initialized v0.2594b
[    6.228806] EXT4-fs (sda4): INFO: recovery required on readonly filesystem
[    6.228815] EXT4-fs (sda4): write access will be enabled during recovery
[   22.260366] EXT4-fs (sda4): recovery complete
[   22.263125] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
[   42.443519] usb 1-1: USB disconnect, device number 2
[   67.585147] Adding 4966396k swap on /dev/sda7.  Priority:-1 extents:1 across:4966396k 
[   67.607227] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   67.685727] udevd[490]: starting version 175

and

[  117.640842] v4l2loopack driver version 1.0.2 loaded
[  117.986082] init: plymouth-stop pre-start process (3081) terminated with status 1
[  129.907271] ERROR @wl_cfg80211_get_station : Could not get rate (-1)
[  129.907296] ERROR @wl_cfg80211_get_station : Could not get rssi (-1)
[  129.907330] ERROR @wl_cfg80211_get_station : Could not get rate (-1)
[  129.907348] ERROR @wl_cfg80211_get_station : Could not get rssi (-1)
[  129.907378] ERROR @wl_dev_intvar_get : error (-1)
[  129.907393] ERROR @wl_cfg80211_get_tx_power : error (-1)
[  146.607658] NMI watchdog enabled, takes one hw-pmu counter.
[  146.617443] NMI watchdog enabled, takes one hw-pmu counter.
[  177.376904] ERROR @wl_cfg80211_get_station : Could not get rate (-1)
[  177.376933] ERROR @wl_cfg80211_get_station : Could not get rssi (-1)

As you can see, the gaps are pretty big. How should I fix this problem? I only know how to take the log file, I don't know how to fix those gaps. Please help

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It might be advantageous to have a Bootchart of the situation so you can visualise what's going on. Create one and upload it somewhere and edit your question to include it please. Here's how: wiki.ubuntu.com/BootCharting –  Oli Aug 12 '13 at 16:06

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