Solved Ubuntu Desktop v14.04 boot menu failed to appear error after installation in the Dell Optiplex 9020 pc (Rev: 1.0)

Situation

The Dell Optiplex 9020 pc comes with 2 pieces of Seagate Barracuda 1 TB SATA 6.0 Gb/s hardisk installed:

• hardisk 0 (ST1000DM003-1CH162 that is the second boot in the BIOS boot sequence) will be installed with Ubuntu Desktop v14.04 Operating System (OS).
  
  

• hardisk 1 (ST1000DM003-1CH162 that is the first boot in the BIOS boot sequence) was already installed with Windows 7 Enterprise x64 SP1 OS.

I installed Ubuntu Desktop v14.04 at hardisk 0 and have restarted the Dell Optiplex 9020 pc after the end of the Ubuntu Desktop v14.04 installation. The Ubuntu boot up menu did not appear during boot up and the pc boot directly into Windows 7 OS. This is because the Dell Optiplex 9020 pc BIOS default boot sequence is still set to boot from hardisk 1 (where Windows 7 Enterprise x64 SP1 OS is installed) first.

Solution

After changing the Dell Optiplex 9020 pc BIOS boot sequence (press [F2] to boot into BIOS > General > Boot Sequence) to boot from hardisk 0 (where Ubuntu Desktop v14.04 OS is installed) first, the Ubuntu boot up menu appear during boot up.

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Ubuntu Boot Repair Tool

You can try the Ubuntu Boot Repair Tool from an Ubuntu LiveCD or LiveUSB thumbdrive to fix the Ubuntu bootloader (GRUB) problem:

1) Please boot from Ubuntu LiveCD or LiveUSB thumbdrive > click "Try Ubuntu".

2) In Ubuntu Live, make sure you have internet connection because we need to install the Ubuntu Boot Repair Tool. Kindly open a terminal (term) and type the below commands to install the Ubuntu Boot Repair Tool:

sudo add-apt-repository -y ppa:yannubuntu/boot-repair

sudo sed 's/trusty/saucy/g' -i /etc/apt/sources.list.d/yannubuntu-boot-repair-trusty.list

sudo apt-get update

sudo apt-get install -y boot-repair && boot-repair


3) In the pop up "Boot Repair" > click "Recommended repair (repairs most frequent problems)"

4) After the recommended boot repair is completed, please restart your pc.

5) For Dell Optiplex 9020 pc, press [F2] to boot into BIOS. Please change the BIOS boot sequence to boot from that hardisk where Ubuntu Desktop v14.04 OS is installed.

Reference:

1. How to install the Boot-Repair tool in an Ubuntu live disc ?