Comment 24 for bug 713385

One of UA customer runs into this issue at 20.04.
The customer is not using PXE boot to install server. The customer is using a customized ISO to install the server, so the comment #18 is not applicable.

For example, the preseed is like

d-i netcfg/choose_interface select auto
d-i netcfg/disable_autoconfig boolean true
d-i netcfg/get_ipaddress string 10.x.x.x
d-i netcfg/get_netmask string 255.255.255.224
d-i netcfg/get_gateway string 10.x.x.x
d-i netcfg/get_nameservers string 10.x.x.x
d-i netcfg/confirm_static boolean true

When the server has multiple interfaces but only one interface is connected, the 'auto' can not recognize the right one.
The workaround is to select the right one manually as 'd-i netcfg/choose_interface select eno5'.

But if different machines have different interfaces being connected, the customized ISO will need to be constantly modified accordingly.