Installing ubuntu without a flash drive?

Android phone rooted, for him to put progenie drivedroid
to phone pour iso image path "where" to look/to set (I usually set up on microSD) in the settings drivedroid - image directories.
then run drivedroid, it will show the contents diry
long click on the desired image and choose the menu convert image using isohybrid
Then cordo click on the image and mounted on one of the "landing" places (usually two).
drivedroid will re-tune the USB-subsystem of Android (that's to ponadobitsa Ruth) and to computer your phone will appear as a USB drive with the image from which to boot.
restart the computer - enter the menu select boot device and choose the device linux image chegoto there
then go to boot from the iso image.
a lot of Linux and Windows so set.

a bunch of iso images you can swing from the drivedroid

Well, try to play with grub4dos, it can MapIT iso images into memory.
I warn you in advance, you will have one attempt.

Don't know how to construct a modern installare Ubuntu, but Windows is perfectly even with your computer, which is mounted in a virtual drive. Ubuntu like too know how this trick (but not exactly).