My Ubuntu 16.04 Kickstart file (x64)

ks.cfg

#Generated by Kickstart Configurator
#platform=AMD64 or Intel EM64T

#System language
lang en_US
#Language modules to install
langsupport en_US
#System keyboard
keyboard us
#System mouse
mouse
#System timezone
timezone Asia/Karachi
#Root password (password:toor)
rootpw --iscrypted $1$UHBe2omd$BsD/nfZ0aCp0h53r4lpaw1
#Initial user (password:resu)
user user --fullname "user" --iscrypted --password $1$nLW79kgr$mxQvGAFNVNSVJMFHqB1NR/
#Reboot after installation
reboot
#Use text mode install
text
#Install OS instead of upgrade
install
#Use CDROM installation media
cdrom
#System bootloader configuration
bootloader --location=mbr 
#Clear the Master Boot Record
zerombr yes
#Partition clearing information
clearpart --all --initlabel 
#Disk partitioning information
part / --fstype ext4 --size 1 --grow 
part swap --recommended 
#System authorization infomation
auth  --useshadow  --enablemd5 
#Network information
network --bootproto=dhcp --device=eth0
#Firewall configuration
firewall --disabled 
#X Window System configuration information
xconfig --depth=32 --resolution=1280x1024 --defaultdesktop=GNOME --startxonboot

part / --fstype ext4 --size 1 --grow 
part swap --recommended ``` 

does that mean it takes all the space on the disk?

@qubusp Yep it means it expands the partition to fill available space on the disk.