Raspberry Pi 4 install

pi@raspberrypi:~ $ sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key 3cb9fd148f374fef
Executing: /tmp/apt-key-gpghome.2OYBziChRB/gpg.1.sh --keyserver hkp://keys.gnupg.net --recv-key 3cb9fd148f374fef
gpg: key 3CB9FD148F374FEF: public key "EMC Archive Signing Key <emc-board@linuxcnc.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1
pi@raspberrypi:~ $ echo deb http://linuxcnc.org/ buster base 2.8-rt | sudo tee -a /etc/apt/sources.list.d/linuxcnc.list
deb http://linuxcnc.org/ buster base 2.8-rt
pi@raspberrypi:~ $ sudo apt-get update
Get:1 http://deb.debian.org/debian buster InRelease [121 kB]
Get:2 http://linuxcnc.org buster InRelease [28.5 kB]                           
Get:3 http://deb.debian.org/debian-security buster/updates InRelease [65.4 kB] 
Get:4 http://archive.raspberrypi.org/debian buster InRelease [32.6 kB]         
Get:5 http://deb.debian.org/debian buster-updates InRelease [51.9 kB]
Get:6 http://deb.debian.org/debian buster/main armhf Packages [7,698 kB]
Get:7 http://linuxcnc.org buster/base armhf Packages [5,153 B]
Get:8 http://linuxcnc.org buster/2.8-rt armhf Packages [1,587 B]               
Get:9 http://archive.raspberrypi.org/debian buster/main arm64 Packages [244 kB]
Get:10 http://archive.raspberrypi.org/debian buster/main armhf Packages [336 kB]
Get:11 http://deb.debian.org/debian buster/main arm64 Packages [7,736 kB]
Get:12 http://deb.debian.org/debian buster/main Translation-en [5,968 kB]      
Get:13 http://deb.debian.org/debian buster/contrib armhf Packages [40.4 kB]    
Get:14 http://deb.debian.org/debian buster/contrib arm64 Packages [38.7 kB]    
Get:15 http://deb.debian.org/debian-security buster/updates/main arm64 Packages [248 kB]
Get:16 http://deb.debian.org/debian-security buster/updates/main armhf Packages [248 kB]
Get:17 http://deb.debian.org/debian-security buster/updates/main Translation-en [138 kB]
Get:18 http://deb.debian.org/debian buster-updates/main arm64 Packages [7,848 B]
Get:19 http://deb.debian.org/debian buster-updates/main armhf Packages [7,844 B]
Fetched 23.0 MB in 16s (1,433 kB/s)                                            
Reading package lists... Done
N: Repository 'http://deb.debian.org/debian buster InRelease' changed its 'Version' value from '10.5' to '10.6'
N: Skipping acquire of configured file 'base/binary-arm64/Packages' as repository 'http://linuxcnc.org buster InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file '2.8-rt/binary-arm64/Packages' as repository 'http://linuxcnc.org buster InRelease' doesn't support architecture 'arm64'
pi@raspberrypi:~ $ sudo apt-get install linux-image-4.14.174-rtai-amd64
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package linux-image-4.14.174-rtai-amd64
E: Couldn't find any package by glob 'linux-image-4.14.174-rtai-amd64'
E: Couldn't find any package by regex 'linux-image-4.14.174-rtai-amd64'
pi@raspberrypi:~ $