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I am trying to install ubuntu 14.0.4.2 . When I enter the startup of the installation process, it stops at [ 0.000000] tsc: Fast TSC calibration failed and even after a millennium of CPU cycles nothing happens.

What should I do or what am I doing wrong?

P.S.: I have read other similar questions on Superuser or StackOverflow but they all suggest that the error is not serious and that it should go away after a while, but it simply does not.

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Try this:

Open a terminal,

Press Ctrl+Alt+T

Run it:

sudo -i
nano /etc/default/grub

In the file that opens add to the line that reads:

GRUB_CMDLINE_LINUX_DEFAULT="?????????????"

Which following

clocksource=acpi_pm

To be well:

GRUB_CMDLINE_LINUX_DEFAULT="?????????????clocksource=acpi_pm"

Ctrl + U, paste.Ctrl + O, save file. Ctrl + X, close nano.

Then run:

update-grub
reboot
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But the os is not booting itself, how do I open an terminal? @kyodake – Rashmi Jun 29 '15 at 7:58
    
Boot in recovery mode – kyodake Jun 29 '15 at 10:29
    
@kyodake During 14.04 installation from a DVD, the recovery mode is not visible among the options. what is to be done then? – AruniRC Mar 12 '16 at 23:28
    
Go to: help.ubuntu.com/community/BootOptions – kyodake Mar 13 '16 at 15:04

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