Comment 15 for bug 1794589

As an example of some of the packages that conflict with libssl1.0-dev, due to conflict:

$ sudo apt install libssl1.0-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
...<snip out many, many packages>...
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  apache2-ssl-dev autobahn-cpp-dev eclipse-titan kpatch-build lcmaps-openssl-interface libace-ssl-dev libboinc-app-dev libbotan1.10-dev libbroccoli-dev libc-client2007e-dev libclamav-dev libclaws-mail-dev libcpprest-dev libdcmtk-dev libdkim-dev libghc-hsopenssl-dev
  libglobus-authz-dev libglobus-ftp-client-dev libglobus-ftp-control-dev libglobus-gass-cache-dev libglobus-gass-copy-dev libglobus-gass-transfer-dev libglobus-gridftp-server-control-dev libglobus-gridftp-server-dev libglobus-gsi-callback-dev
  libglobus-gsi-cert-utils-dev libglobus-gsi-credential-dev libglobus-gsi-openssl-error-dev libglobus-gsi-proxy-core-dev libglobus-gsi-proxy-ssl-dev libglobus-gsi-sysconfig-dev libglobus-gss-assist-dev libglobus-gssapi-error-dev libglobus-gssapi-gsi-dev libglobus-io-dev
  libglobus-openssl-module-dev libglobus-xio-gsi-driver-dev libjose-dev libldns-dev libmongoc-dev libneon27-dev libomniorb4-dev libopkele-dev libp11-dev libpantomime1.2-dev libpbbam-dev libpjproject-dev libpkcs11-helper1-dev libpoco-dev libpodofo-dev libserf-dev
  libshout3-dev libsnmp-dev libspice-client-glib-2.0-dev libssh-dev libssl-dev libssl-ocaml-dev libtorrent-rasterbar-dev libtspi-dev libwebsockets-dev libwinpr2-dev libyara-dev nodeenv nordugrid-arc-dev php7.2-dev proftpd-dev python-chef python3-bitcoinlib
  ubuntu-core-libs-dev urweb uwsgi-dev voms-dev xrdp-pulseaudio-installer znc-dev
The following NEW packages will be installed:
  libssl1.0-dev
0 upgraded, 1 newly installed, 74 to remove and 0 not upgraded.
Need to get 1364 kB of archives.
After this operation, 226 MB disk space will be freed.
Do you want to continue? [Y/n]