Copy List of manually installed software from one server to another with same version

I have 2 servers, let's say Server1 and Server2

Server1 is configured long ago by some person which has multiple packages and our application has so many dependencies on those packages. So I want to maintain same set of Packages in new server i.e., Server2 to run our application smoothly.

I used below command to list all the packages from Server1

 dpkg --get-selections > ~/Package.list

Which gives all the Package List Like

accountsservice                                 install
acpid                                           install
adduser                                         install
amd64-microcode                                 install
...
...

I make a copy of the above package list in Server2 and tried to install those Packages using a command

sudo dpkg --set-selections < ~/Package.list

but it says like

dpkg: warning: package not in status nor available database at line 2: acpid
dpkg: warning: package not in status nor available database at line 4: amd64-microcode
dpkg: warning: package not in status nor available database at line 12: apt-transport-https
dpkg: warning: package not in status nor available database at line 14: apt-xapian-index
...
...

Is there any other way to maintain same set of packages in both server?

Both are Same OS with different versions (server1 : Ubuntu 14.04 and server2: Ubuntu 20.04) and I want only user installed packages

Update:

apt list --installed

Above Command displays like

accountsservice/trusty-updates,now 0.6.35-0ubuntu7.3 amd64 [installed]
acpid/trusty,now 1:2.0.21-1ubuntu2 amd64 [installed]
adduser/trusty,now 3.113+nmu3ubuntu3 all [installed]
amd64-microcode/trusty-updates,now 3.20180524.1~ubuntu0.14.04.2+really20130710.1ubuntu1 amd64 [installed,automatic]
apache2/trusty-updates,trusty-security,now 2.4.7-1ubuntu4.22 amd64 [installed]
...

It displays package with version, Is it possible that I can save the result of this output and run in server2 so that I can have same Package with same version.

Were it my system, here's how I would do it:

Packages installed by the user is tracked by apt-marking (see man apt-mark.)

However, there's a small problem: The Ubuntu installer apt-marks everything on a stock install of Ubuntu as manually-installed. It's a safety measure so folks don't erroneously uninstall their desktop.

So it's (sort of) simple subtraction: The list of all manual packages minus the list of stock install packages.

1. Get the list of packages on your 14.04 system that are apt-marked "manual".

   apt-mark showmanual > server1
   

2. Spin up a VM with a fresh Ubuntu 14.04 install, and do the same thing.

   apt-mark showmanual > fresh
   

3. Diff the two files.

   diff --suppress-common-lines fresh server1
   

4. Go through the resulting short list, line by line. You must weed out kernel packages, investigate packages that have been dropped or renamed or otherwise changed, add packages that are no longer part of a stock install, etc. There is no easy or automated way to do it.

A dpkg list is all apps, but only different ones will be installed. Often best to edit out old kernels.

From old install

dpkg --get-selections > ~/my-packages

From new install:

sudo apt-get -y update
sudo apt-get dselect-upgrade
#IF you get this error:
dpkg: warning: package not in database
sudo apt-get install dselect
sudo dselect 
   -> Update
   -> Install

A tabular list of all manually installed packages can be obtained using aptitude which you probably have to install:

aptitude search '~i!~M'

Top level applications:

aptitude --disable-columns -F 'no_dependents %p' search '~i!~M!~R(~i)'

But you then may need to add the install to every line.

How to list all installed packages

Also how to list applications you installed.

How to list all installed packages