I am getting boot time errors in ubuntu 14.04. After booting it works without any problem. Errors displayed are:
0.669116] dmar: Failed to find handle for ACPI object \ SB.PCI0SD
After SD some numbers are also displayed (I could not capture them). This error is displayed in black screen.Next this error is shown:

Also it's written 'Ubuntu 14.04' rather than 'ubuntu'.
Output of dmesg |grep iwl is:
[ 16.302012] iwlwifi 0000:03:00.0: loaded firmware version 25.17.12.0 op_mode iwlmvm
[ 18.182318] iwlwifi 0000:03:00.0: Unsupported splx structure
[ 18.268492] iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 3160, REV=0x164
[ 18.268837] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
[ 18.269360] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
[ 18.490087] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 22.183698] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
[ 22.185198] iwlwifi 0000:03:00.0: L1 Enabled - LTR Enabled
These all happened suddenly. Changes done today can be seen here https://drive.google.com/file/d/0B7vu6OdU_CbuQ1laWHJXSnFRUHc/view?usp=sharing
I am using AMD Radeon R5 M330 graphics card and fglrx driver. I am new to Ubuntu. Please help.