Ubuntu 20.04 kernel 5.11 - cannot install error

[BlueBomber]

Thank you for the reply. I tried that and it gave me a no installation candidate error.

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package linux-headers-5.11.15-051115-generic is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'linux-headers-5.11.15-051115-generic' has no installation candidate

I went ahead and upgraded to 21.04 Hirsute Hippo along with having the 5.11 kernel as I saw that others had better success this way. Still nothing.

After upgradeing the OS, I did:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt install linux-headers-$(uname -r)

same result.

apt-cache search linux-headers-

gives me the following:

linux-headers-5.11.0-1004-azure - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-1005-oracle - Oracle Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-1006-aws - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-1006-gcp - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-1006-kvm - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-16 - Header files related to Linux kernel version 5.11.0
linux-headers-5.11.0-16-generic - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-5.11.0-16-lowlatency - Linux kernel headers for version 5.11.0 on 64 bit x86 SMP
linux-headers-aws - Linux kernel headers for Amazon Web Services (AWS) systems.
linux-headers-azure - Linux kernel headers for Azure systems.
linux-headers-gcp - Google Cloud Platform (GCP) Linux kernel headers
linux-headers-generic - Generic Linux kernel headers
linux-headers-generic-hwe-20.04 - Generic Linux kernel headers
linux-headers-generic-hwe-20.04-edge - Generic Linux kernel headers
linux-headers-gke - Google Container Engine (GKE) Linux kernel headers
linux-headers-kvm - Linux kernel headers for virtual systems.
linux-headers-lowlatency - lowlatency Linux kernel headers
linux-headers-lowlatency-hwe-20.04 - lowlatency Linux kernel headers
linux-headers-lowlatency-hwe-20.04-edge - lowlatency Linux kernel headers
linux-headers-oem-20.04 - Generic Linux kernel headers (dummy transitional package)
linux-headers-oracle - Linux kernel headers for Oracle systems.
linux-headers-virtual - Virtual Linux kernel headers
linux-headers-virtual-hwe-20.04 - Virtual Linux kernel headers
linux-headers-virtual-hwe-20.04-edge - Virtual Linux kernel headers
linux-libc-dev - Linux Kernel Headers for development
linux-libc-dev-arm64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-armhf-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-ppc64el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-s390x-cross - Linux Kernel Headers for development (for cross-compiling)
linux-virtual - Minimal Generic Linux kernel and headers
linux-virtual-hwe-20.04 - Minimal Generic Linux kernel and headers
linux-virtual-hwe-20.04-edge - Minimal Generic Linux kernel and headers
linux-libc-dev-alpha-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-amd64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-armel-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-hppa-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-i386-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-m68k-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mips-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mips64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mips64el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mips64r6-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mips64r6el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsel-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsn32-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsn32el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsn32r6-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsn32r6el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsr6-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-mipsr6el-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-powerpc-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-ppc64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-riscv64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-sh4-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-sparc64-cross - Linux Kernel Headers for development (for cross-compiling)
linux-libc-dev-x32-cross - Linux Kernel Headers for development (for cross-compiling)
linux-headers-5.10.4-051004 - Header files related to Linux kernel version 5.10.4
linux-headers-5.10.4-051004-generic - Linux kernel headers for version 5.10.4 on 64 bit x86 SMP
linux-headers-5.11.0-051100 - Header files related to Linux kernel version 5.11.0
linux-headers-5.11.15-051115 - Header files related to Linux kernel version 5.11.15
linux-headers-5.4.0-050400 - Header files related to Linux kernel version 5.4.0
linux-headers-5.9.1-050901 - Header files related to Linux kernel version 5.9.1
linux-headers-5.9.1-050901-generic - Linux kernel headers for version 5.9.1 on 64 bit x86 SMP

And I am stuck here for now. Any help is appreciated. Thanks again.