Install scrcpy

 $ sudo apt install scrcpy
[sudo] password for dhwan:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  scrcpy-server
The following NEW packages will be installed:
  scrcpy scrcpy-server
0 upgraded, 2 newly installed, 0 to remove and 25 not upgraded.
Need to get 56,4 kB of archives.
After this operation, 132 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 scrcpy-server all 1.12.1+ds-1 [27,0 kB]
Get:2 http://id.archive.ubuntu.com/ubuntu focal/universe amd64 scrcpy amd64 1.12.1+ds-1 [29,4 kB]
Fetched 56,4 kB in 3s (18,7 kB/s)
Selecting previously unselected package scrcpy-server.
(Reading database ... 287694 files and directories currently installed.)
Preparing to unpack .../scrcpy-server_1.12.1+ds-1_all.deb ...
Unpacking scrcpy-server (1.12.1+ds-1) ...
Selecting previously unselected package scrcpy.
Preparing to unpack .../scrcpy_1.12.1+ds-1_amd64.deb ...
Unpacking scrcpy (1.12.1+ds-1) ...
Setting up scrcpy-server (1.12.1+ds-1) ...
Setting up scrcpy (1.12.1+ds-1) ...
Processing triggers for man-db (2.9.1-1) ...