I tried a bit different kickstart line and it works!
In ubuntu-installer/amd64/boot-screens/txt.cfg:
default install label install menu label ^Install menu default kernel ubuntu-installer/amd64/linux append http_proxy="http://192.168.1.1:80" ks=http://192.168.1.1/kickstart/ks.cfg vga=normal initrd=ubuntu-installer/amd64/initrd.gz -- quiet
I tried a bit different kickstart line and it works!
In ubuntu- installer/ amd64/boot- screens/ txt.cfg:
default install installer/ amd64/linux 192.168. 1.1:80" ks=http:// 192.168. 1.1/kickstart/ ks.cfg vga=normal initrd= ubuntu- installer/ amd64/initrd. gz -- quiet
label install
menu label ^Install
menu default
kernel ubuntu-
append http_proxy="http://