When acpica-tools is not installed, running acpidump or acpixtract produces no suggestions (in either Bionic or Cosmic):

$ acpixtract
acpixtract: command not found
$ apt-cache policy acpitools-ca
N: Unable to locate package acpitools-ca
$ apt-cache policy acpica-tools
acpica-tools:
Installed: (none)
Candidate: 20180629-1
Version table:
20180629-1 500
500 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages
$ sudo apt install acpica-tools
[sudo] password for jani:
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following packages were automatically installed and are no longer required:
linux-headers-4.18.0-8 linux-headers-4.18.0-8-generic linux-image-4.18.0-8-generic linux-modules-4.18.0-8-generic
linux-modules-extra-4.18.0-8-generic
Use ’sudo apt autoremove’ to remove them.
The following NEW packages will be installed:
acpica-tools
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 851 kB of archives.
After this operation, 2782 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu cosmic/universe amd64 acpica-tools amd64 20180629-1 [851 kB]
Fetched 851 kB in 1s (1622 kB/s)
Selecting previously unselected package acpica-tools.
(Reading database … 207563 files and directories currently installed.)
Preparing to unpack …/acpica-tools_20180629-1_amd64.deb …
Unpacking acpica-tools (20180629-1) …
Setting up acpica-tools (20180629-1) …
update-alternatives: using /usr/bin/acpixtract-acpica to provide /usr/bin/acpixtract (acpixtract) in auto mode
update-alternatives: warning: skip creation of /usr/share/man/man1/acpixtract.1.gz because associated file /usr/share/man/man1/acpixtract-acpica.1 (of link group acpixtract) doesn’t exist
update-alternatives: using /usr/bin/acpidump-acpica to provide /usr/bin/acpidump (acpidump) in auto mode
update-alternatives: warning: skip creation of /usr/share/man/man1/acpidump.1.gz because associated file /usr/share/man/man1/acpidump-acpica.1 (of link group acpidump) doesn’t exist
Processing triggers for man-db (2.8.4-2) …
$ acpidump
Could not open table file: /sys/firmware/acpi/tables/SSDT
Could not get ACPI tables, AE_ACCESS
$ acpixtract

Intel ACPI Component Architecture
ACPI Binary Table Extraction Utility version 20180629
Copyright (c) 2000 – 2018 Intel Corporation

Usage: acpixtract [option] <InputFile>
Options:
-a Extract all tables, not just DSDT/SSDT
-f Force extraction, even if there are errors
-l List table summaries, do not extract
-m Extract multiple DSDT/SSDTs to a single file
-s <signature> Extract all tables with <signature>
-v Display version information
-vd Display build date and time

Extract binary ACPI tables from text acpidump output
Default invocation extracts the DSDT and all SSDTs