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It sounds like something is broken at the server's filesystem level.

First, try deleting the following folders:

• administrator/components/com_admintools
• components/com_admintools
• media/com_admintools (if it exists)
• plugins/system/admintools

If you get any errors please report them to your host. I give it a 90% chance that this will happen based on the error message about an “inaccessible file” Joomla is showing you.

Once you have fixed any problems and have these folders removed you can install the latest version of Admin Tools 6.

This message is coming from Joomla. Do keep in mind that the code which installs and updates extensions is handled by Joomla itself, not us. Also keep in mind that Joomla's error messages are useless for troubleshooting. I am trying to divine what the problem is without having anything to go by but my experience and a single filename without a path. Since you're a Linux admin I can go more technical and explain how my divination process works :) 

All we have to go by is that there is a file called admintools.php Joomla cannot remove. But where is that file? Well, find to the rescue! From the site's root I do:

$ find . -type f -name admintools.php -exec ls -l \{} \;
-rw-r--r--  1 nicholas  staff  1676 Jul 11 10:22 ./plugins/system/admintools/admintools.php
-rw-r--r--  1 nicholas  staff  1886 Sep 22  2021 ./plugins/system/admintools.php
-rw-r--r--  1 nicholas  staff  25187 Jul 11 10:22 ./plugins/actionlog/admintools/admintools.php
-rw-r--r--  1 nicholas  staff  5923 Jul 11 10:22 ./plugins/installer/admintools/admintools.php
-rw-r--r--  1 nicholas  staff  1182 Jul 11 10:22 ./components/com_admintools/admintools.php
-rw-r--r--  1 nicholas  staff  1968 Jul 11 10:22 ./administrator/components/com_admintools/admintools.php

So, apart from the locations I already told you about (which is where such a problem would usually come from, according to my experience) there are another two directories you will have to delete:

• plugins/actionlog/admintools
• plugins/installer/admintools

Then redo the installation as I said in my previous reply. If that worked, stop reading here.

If you still get the same error about an inaccessible file it will be a very useful point: having already deleted all the directories on your site where this file lives, the fact that Joomla still complains would mean that it's complaining about its temporary directory. When you install or update an extension Joomla extracts the ZIP file of the extension in a temporary subdirectory under your site's configured temporary directory. If that subdirectory is deleted outside of Joomla or, at least, outside of the page load performing the extension installation / update Joomla will fail to install the new extension version, hence the “Error installing package” message. It will proceed to the temporary files cleanup stage. But if the file is already gone it won't be able to delete it, hence the File::delete error message. In this case you'll have to set up a different temporary directory in your Global Configuration and disable any third party plugins which may be removing temporary files.

Most likely something went very bad at the filesystem side on your server. It is rare but it does happen; we do get 1-2 tickets every year with an issue like that and it's happened to me too when an unplanned emergency shutdown (read: the power went off and the UPS decided to also die at the same time...) resulted in the office server's filesystem getting corrupt. You should be able to reinstall both components now without a problem.