echo "deb http://ftp.debian.org/debian buster-backports main" | sudo tee -a /etc/apt/sources.list > /dev/null
sudo apt-get -t buster-backports upgrade
apt search Linux-image
result look like (with first phrase split by slash is image name which can install-able)
linux-headers-4.19.0-6-amd64/stable 4.19.67-2+deb10u2 amd64
Header files for Linux 4.19.0-6-amd64
linux-headers-4.19.0-6-cloud-amd64/stable 4.19.67-2+deb10u2 amd64
Header files for Linux 4.19.0-6-cloud-amd64
linux-headers-4.19.0-6-rt-amd64/stable 4.19.67-2+deb10u2 amd64
Header files for Linux 4.19.0-6-rt-amd64
linux-headers-4.19.0-8-amd64/stable,stable 4.19.98-1 amd64
Header files for Linux 4.19.0-8-amd64
linux-headers-4.19.0-8-cloud-amd64/stable,stable 4.19.98-1 amd64
Header files for Linux 4.19.0-8-cloud-amd64
linux-headers-4.19.0-8-rt-amd64/stable,stable 4.19.98-1 amd64
Header files for Linux 4.19.0-8-rt-amd64
linux-headers-5.4.0-0.bpo.2-amd64/buster-backports 5.4.8-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.2-amd64
linux-headers-5.4.0-0.bpo.2-cloud-amd64/buster-backports 5.4.8-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.2-cloud-amd64
linux-headers-5.4.0-0.bpo.2-rt-amd64/buster-backports 5.4.8-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.2-rt-amd64
linux-headers-5.4.0-0.bpo.3-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.3-amd64
linux-headers-5.4.0-0.bpo.3-cloud-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.3-cloud-amd64
linux-headers-5.4.0-0.bpo.3-rt-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.3-rt-amd64
linux-headers-5.4.0-0.bpo.4-amd64/buster-backports 5.4.19-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.4-amd64
linux-headers-5.4.0-0.bpo.4-cloud-amd64/buster-backports 5.4.19-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.4-cloud-amd64
linux-headers-5.4.0-0.bpo.4-rt-amd64/buster-backports 5.4.19-1~bpo10+1 amd64
Header files for Linux 5.4.0-0.bpo.4-rt-amd64
linux-image-4.19.0-6-amd64/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for 64-bit PCs (signed)
linux-image-4.19.0-6-amd64-dbg/stable 4.19.67-2+deb10u2 amd64
Debug symbols for linux-image-4.19.0-6-amd64
linux-image-4.19.0-6-amd64-unsigned/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for 64-bit PCs
linux-image-4.19.0-6-cloud-amd64/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for x86-64 cloud (signed)
linux-image-4.19.0-6-cloud-amd64-dbg/stable 4.19.67-2+deb10u2 amd64
Debug symbols for linux-image-4.19.0-6-cloud-amd64
linux-image-4.19.0-6-cloud-amd64-unsigned/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for x86-64 cloud
linux-image-4.19.0-6-rt-amd64/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for 64-bit PCs, PREEMPT_RT (signed)
linux-image-4.19.0-6-rt-amd64-dbg/stable 4.19.67-2+deb10u2 amd64
Debug symbols for linux-image-4.19.0-6-rt-amd64
linux-image-4.19.0-6-rt-amd64-unsigned/stable 4.19.67-2+deb10u2 amd64
Linux 4.19 for 64-bit PCs, PREEMPT_RT
linux-image-4.19.0-8-amd64/stable,stable,now 4.19.98-1 amd64 [installed]
Linux 4.19 for 64-bit PCs (signed)
linux-image-4.19.0-8-amd64-dbg/stable,stable 4.19.98-1 amd64
Debug symbols for linux-image-4.19.0-8-amd64
linux-image-4.19.0-8-amd64-unsigned/stable,stable 4.19.98-1 amd64
Linux 4.19 for 64-bit PCs
linux-image-4.19.0-8-cloud-amd64/stable,stable 4.19.98-1 amd64
Linux 4.19 for x86-64 cloud (signed)
linux-image-4.19.0-8-cloud-amd64-dbg/stable,stable 4.19.98-1 amd64
Debug symbols for linux-image-4.19.0-8-cloud-amd64
linux-image-4.19.0-8-cloud-amd64-unsigned/stable,stable 4.19.98-1 amd64
Linux 4.19 for x86-64 cloud
linux-image-4.19.0-8-rt-amd64/stable,stable 4.19.98-1 amd64
Linux 4.19 for 64-bit PCs, PREEMPT_RT (signed)
linux-image-4.19.0-8-rt-amd64-dbg/stable,stable 4.19.98-1 amd64
Debug symbols for linux-image-4.19.0-8-rt-amd64
linux-image-4.19.0-8-rt-amd64-unsigned/stable,stable 4.19.98-1 amd64
Linux 4.19 for 64-bit PCs, PREEMPT_RT
linux-image-5.4.0-0.bpo.2-amd64/buster-backports,now 5.4.8-1~bpo10+1 amd64 [installed]
Linux 5.4 for 64-bit PCs (signed)
linux-image-5.4.0-0.bpo.2-amd64-dbg/buster-backports 5.4.8-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.2-amd64
linux-image-5.4.0-0.bpo.2-amd64-unsigned/buster-backports 5.4.8-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs
linux-image-5.4.0-0.bpo.2-cloud-amd64/buster-backports 5.4.8-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud (signed)
linux-image-5.4.0-0.bpo.2-cloud-amd64-dbg/buster-backports 5.4.8-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.2-cloud-amd64
linux-image-5.4.0-0.bpo.2-cloud-amd64-unsigned/buster-backports 5.4.8-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud
linux-image-5.4.0-0.bpo.2-rt-amd64/buster-backports 5.4.8-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT (signed)
linux-image-5.4.0-0.bpo.2-rt-amd64-dbg/buster-backports 5.4.8-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.2-rt-amd64
linux-image-5.4.0-0.bpo.2-rt-amd64-unsigned/buster-backports 5.4.8-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT
linux-image-5.4.0-0.bpo.3-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs (signed)
linux-image-5.4.0-0.bpo.3-amd64-dbg/buster-backports 5.4.13-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.3-amd64
linux-image-5.4.0-0.bpo.3-amd64-unsigned/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs
linux-image-5.4.0-0.bpo.3-cloud-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud (signed)
linux-image-5.4.0-0.bpo.3-cloud-amd64-dbg/buster-backports 5.4.13-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.3-cloud-amd64
linux-image-5.4.0-0.bpo.3-cloud-amd64-unsigned/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud
linux-image-5.4.0-0.bpo.3-rt-amd64/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT (signed)
linux-image-5.4.0-0.bpo.3-rt-amd64-dbg/buster-backports 5.4.13-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.3-rt-amd64
linux-image-5.4.0-0.bpo.3-rt-amd64-unsigned/buster-backports 5.4.13-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT
linux-image-5.4.0-0.bpo.4-amd64/buster-backports,now 5.4.19-1~bpo10+1 amd64 [installed]
Linux 5.4 for 64-bit PCs (signed)
linux-image-5.4.0-0.bpo.4-amd64-dbg/buster-backports 5.4.19-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.4-amd64
linux-image-5.4.0-0.bpo.4-amd64-unsigned/buster-backports 5.4.19-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs
linux-image-5.4.0-0.bpo.4-cloud-amd64/buster-backports 5.4.19-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud (signed)
linux-image-5.4.0-0.bpo.4-cloud-amd64-dbg/buster-backports 5.4.19-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.4-cloud-amd64
linux-image-5.4.0-0.bpo.4-cloud-amd64-unsigned/buster-backports 5.4.19-1~bpo10+1 amd64
Linux 5.4 for x86-64 cloud
linux-image-5.4.0-0.bpo.4-rt-amd64/buster-backports 5.4.19-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT (signed)
linux-image-5.4.0-0.bpo.4-rt-amd64-dbg/buster-backports 5.4.19-1~bpo10+1 amd64
Debug symbols for linux-image-5.4.0-0.bpo.4-rt-amd64
linux-image-5.4.0-0.bpo.4-rt-amd64-unsigned/buster-backports 5.4.19-1~bpo10+1 amd64
Linux 5.4 for 64-bit PCs, PREEMPT_RT
linux-image-amd64/stable,stable,now 4.19+105+deb10u3 amd64 [installed]
Linux for 64-bit PCs (meta-package)
linux-image-amd64-dbg/stable,stable 4.19+105+deb10u3 amd64
Debugging symbols for Linux amd64 configuration (meta-package)
linux-image-amd64-signed-template/stable,stable 4.19.98-1 amd64
Template for signed linux-image packages for amd64
linux-image-cloud-amd64/stable,stable 4.19+105+deb10u3 amd64
Linux for x86-64 cloud (meta-package)
linux-image-cloud-amd64-dbg/stable,stable 4.19+105+deb10u3 amd64
Debugging symbols for Linux cloud-amd64 configuration (meta-package)
linux-image-rt-amd64/stable,stable 4.19+105+deb10u3 amd64
Linux for 64-bit PCs (meta-package), PREEMPT_RT
linux-image-rt-amd64-dbg/stable,stable 4.19+105+deb10u3 amd64
Debugging symbols for Linux rt-amd64 configuration (meta-package)
Choose image which you want to install,
sudo apt-get -t buster-backports install linux-image-5.4.0-0.bpo.4-amd64
uname -r
