I have scripts that rely on dhclient, but its missing from the repos for Excalibur.

Synaptic finds isc-dhcp-client and informs me...

DHCP client for automatically obtaining an IP address (deprecated)
 
This is the Internet Software Consortium's DHCP client.
.
Dynamic Host Configuration Protocol (DHCP) is a protocol like BOOTP
(actually dhcpd includes much of the functionality of bootpd). It
gives client machines "leases" for IP addresses and can
automatically set their network configuration. If your machine
depends on DHCP (especially likely if it's a workstation on a large
network, or a laptop, or attached to a cable modem), keep this or
another DHCP client installed.

Extra documentation can be found in the package isc-dhcp-common.

ISC has decided to stop maintaining the client and relay parts of isc-dhcp,
and they will be removed after the 4.4.3 release, keeping only the server
component. Please, consider using an alternative for isc-dhcp-client
(dhclient).

More information can be found in the ISC official announcement:
https://www.isc.org/blogs/dhcp-client-relay-eom/

ISC has deprecated the DHCP project. See:
https://www.isc.org/blogs/isc-dhcp-eol/.

...so, is dhclient the upgrade, or just another name for isc-dhcp-client?

A: If dhclient is the alternative mentioned, can we have it back please?
...or,
B: Is there a similar alternative I should be looking at in the repos?

NOTE: My bare-bones OS does not have nmcli/tui/gui as it's deps include unwanted gtk stuff.