Ubuntu – How to install ubuntu without a any cd or usb drive

You can use dd.

 sudo umount /dev/sd<?><?>  

where <?><?> is a letter followed by a number, look it up by running lsblk.

It will look something like

sdb      8:16   1  14.9G  0 disk 
├─sdb1   8:17   1   1.6G  0 part /media/username/usb volume name
└─sdb2   8:18   1   2.4M  0 part 

I would dismount sdb1.

Then, next (this is a destructive command and wipes the entire USB drive with the contents of the iso, so be careful):

 sudo dd bs=4M if=path/to/input.iso of=/dev/sd<?> conv=fdatasync  status=progress

where input.iso is the input file, and /dev/sd<?> is the USB device you're writing to (run lsblk to see all drives to find out what <?> is for your USB).

This method is fast and has never failed me.

EDIT: for those on a Mac ending up here, use lowercase for bs=4m:

sudo dd if=inputfile.img of=/dev/disk<?> bs=4m && sync

EDIT: If USB drive does not boot (this happened to me), it is because the target is a particular partition on the drive instead of the drive. So the target needs to be /dev/sdc and not dev/sdc <?> For me it was /dev/sdb .

Reference: https://superuser.com/a/407327 and https://askubuntu.com/a/579615/669976

Update:

It is not a matter of the hardware being unable to run Ubuntu 13.x, but rather because of Sony's overly proprietary BIOS limitations. The solution that I used successfully unfortunately does not qualify as "without network connection", but aside from that, may be useful to others so long as they are able to connect to the internet.

I created a tiny partition on an otherwise blank hard drive to simulate the size of CD-ROM media, and copied Ubuntu's mini.iso to that partition. The Viao Desktop hardware was able to recognize it as executable during boot and from there, install over the net as if it had been booted using a CD-ROM copy of mini.iso.