Accessing your Virtualbox Guest from your Host OS

  1. If your guest machine is running, shut it down first.
  2. Click on File->Preferences in the VirtualBox menu-bar.
    screenshot-vbox-menubar
  3. Select the Network option from the side menu and click on the Host-only networks tab.
    screenshot-vbox-host-only-network-add-new
  4. The default options for the newly-created Host-only network should be fine. If not, you can add the following data manually, by clicking on the Edit button in the DHCP Server tab.
    • Server Address192.168.56.100
    • Server Mask255.255.255.0
    • Lower Address Bound192.168.56.101
    • Upper Address Bound192.168.56.254
    Don't forget to check the Enable Server option.
    screenshot-vbox-host-only-network-edit
    screenshot-vbox-host-only-network-dhcp-settings
  5. Now save all the settings in Preferences.
  6. Now open up the settings of your Guest machine and navigate to the Network option from the side menu and click on the Adapter 2 tab.
    screenshot-vbox-guest-settings
    screenshot-vbox-guest-settings-network-
  7. In the Attached to section, click on the dropdown and choose Host-only Adapter and in the Name section nested in it, choose the newly-created Host-only network.
    Don't forget to check the Enable Network Adapter option.
    screenshot-vbox-guest-network-adapter
  8. Save these settings and boot into your Guest machine.
  9. After logging in, type ifconfig. Note the new IP, it should be under a new interface like eth0 or vboxnet0. Now you can use this IP to SSH, view the webpages on your machine's Apache Server, etc..
Thanks to  2Ubuntu

How to create JDeveloper 12c Ubuntu desktop shortcut

How to launch Oracle JDeveloper 12c from desktop on Ubuntu.

1# Open Terminal (press CTRL+ALT+T)

2#Write the following code (replace by your Linux UsrName)
/home/USER/Oracle/Middleware/Oracle_Home/jdeveloper/jdev/bin/addjdevtodesktop

3# It's done.

Cannot use “Erase All Contents and Setting” in iOS 11 beta , Here's how to fix it

After Apple last iOS release 11 , I downloaded it using beta profile.

But I found that I cannot use “Erase All Contents and Setting”  under Settings.

Here's how to fix it.
1# Remove beta profile .
settings then General then Profile then iOS profile then Delete Profile then Restart iPhone

2# Sign Out  from iCloud

3# Restart iPhone  , and it's ok.

enjoy....