echo "deb http://linux.dell.com/repo/community/openmanage/10100/focal/ focal main" > /etc/apt/sources.list.d/linux.dell.com.sources.list
wget -qO - https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc | apt-key add -
apt update
apt install srvadmin-all

The following packages have unmet dependencies:
 srvadmin-itunnelprovider : Depends: sfcb (>= 1.3.7) but it is not installable
                            Depends: libcimcclient0 (>= 2.2.1) but it is not installable
                            Depends: openwsman (>= 2.2.3) but it is not installable
                            Depends: libcmpicppimpl0 (>= 2.0.0) but it is not installable

cd /usr/src
wget http://archive.ubuntu.com/ubuntu/pool/universe/s/sblim-sfc-common/libsfcutil0_1.0.1-0ubuntu4_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/multiverse/c/cim-schema/cim-schema_2.48.0-0ubuntu1_all.deb
dpkg -i libsfcutil0_1.0.1-0ubuntu4_amd64.deb
dpkg -i cim-schema_2.48.0-0ubuntu1_all.deb

wget http://archive.ubuntu.com/ubuntu/pool/multiverse/s/sblim-sfcb/sfcb_1.4.9-0ubuntu5_amd64.deb
dpkg -i sfcb_1.4.9-0ubuntu5_amd64.deb

wget http://archive.ubuntu.com/ubuntu/pool/universe/s/sblim-sfcc/libcimcclient0_2.2.8-0ubuntu2_amd64.deb
dpkg -i libcimcclient0_2.2.8-0ubuntu2_amd64.deb

wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openwsman/libwsman-curl-client-transport1_2.6.5-0ubuntu3_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openwsman/libwsman-client4_2.6.5-0ubuntu3_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openwsman/libwsman1_2.6.5-0ubuntu3_amd64.deb
wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openwsman/libwsman-server1_2.6.5-0ubuntu3_amd64.deb
dpkg -i libwsman-curl-client-transport1_2.6.5-0ubuntu3_amd64.deb
dpkg -i libwsman-client4_2.6.5-0ubuntu3_amd64.deb
dpkg -i libwsman1_2.6.5-0ubuntu3_amd64.deb
dpkg -i libwsman-server1_2.6.5-0ubuntu3_amd64.deb

wget http://archive.ubuntu.com/ubuntu/pool/universe/o/openwsman/openwsman_2.6.5-0ubuntu3_amd64.deb
dpkg -i openwsman_2.6.5-0ubuntu3_amd64.deb

wget http://archive.ubuntu.com/ubuntu/pool/universe/s/sblim-cmpi-devel/libcmpicppimpl0_2.0.3-0ubuntu2_amd64.deb
dpkg -i libcmpicppimpl0_2.0.3-0ubuntu2_amd64.deb