After hours of looking for a solution I was satisfied with, I finally stumbled across one! Hope this helps anyone else looking to install MongoDB community edition without sacrificing security by using libssl1.1 (the solution here uses >3.0.

MongoDB has the repository for Ubuntu 22.04.1 LTS (Jammy Jellyfish) hidden away. It definitely still isn't on the documentation installation pages as of the time I am posting this. Check it out yourself: https://repo.mongodb.org/apt/ubuntu/dists/jammy/mongodb-org/

The following code will add the repository and install the latest mongodb-org on your system:

sudo apt-get install wget gpg
wget -qO - https://www.mongodb.org/static/pgp/server-6.0.asc | gpg --dearmor > packages.mongodb.gpg
sudo install -D -o root -g root -m 644 packages.mongodb.gpg /etc/apt/keyrings/packages.mongodb.gpg
echo "deb [ arch=amd64,arm64 signed-by=/etc/apt/keyrings/packages.mongodb.gpg] https://repo.mongodb.org/apt/ubuntu jammy/mongodb-org/6.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-6.0.list
rm -f packages.mongodb.gpg
sudo apt-get install -y mongodb-org

I was facing a libssl1.1 issue when trying to install mongo-db in Pop!_OS 22.04 LTS (or Ubuntu 22.04 LTS).

As @stephen-kitt mentioned libssl1.x is an obsolete package. So you need to manually install the required package.

1. Go to this page
2. Find the exact version of libssl for example libssl1.1.1
3. wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb (use your version url respectively)
4. Then install with sudo dpkg -i libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb

Hope this helps others who are trying to do the same.

The issue is referenced on Github, all credit goes to @feisalramar.

I've encountered this issue with 22.04 LTS, ended up writing the following script for my systems to have it installed, as one of the tools I use to setup the system requires it.

Hope others find this useful.

# Find the most recent 1.1 libssl package in the ubuntu archives
BASE_URL='http://archive.ubuntu.com/ubuntu/pool/main/o/openssl'
FILE="$( # The get parameters in the URL sort the results by descending chronological order
    curl -s "${BASE_URL}/?C=M;O=D" $(\
        # Make sure all tags are on separate lines - makes grep-work later easier \
        ) | tr '>' '>\n' $(\
        # extract all the unique links on the page \
        ) | grep 'href' | sed 's/^.*href="\([^"]*\)".*$/\1/p' | awk '!a[$0]++' $(\
        # pick the most relevant items on the list (libssl 1.1 for amd64 arch) \
        ) | grep "libssl" | grep "1.1_" | grep "amd64.deb" $(\
        # choose only the last one \
        ) | tail -1 )"
# Grab the file and if download was successful, install it with sudo
wget "${URL_BASE}/${FILE}" && sudo dpkg -i "./${FILE}"

Ubuntu 22.04 doesn't have official MongoDB packages yet, so the best option now is to have Ubuntu 20.04, where official MongoDB packages are available.

It's NOT recommended to use any workaround in Ubuntu 22.04 to install MongoDB, because it can lead to problems if you gonna use it in production. Below is the workaround that worked for me:

1. Download libssl1.1_1.1.1f-1ubuntu2_amd64.deb from official repository:

   wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu2_amd64.deb
   

2. Install it:

   sudo dpkg -i libssl1.1_1.1.1f-1ubuntu2_amd64.deb
   

3. Proceed with the installation of MongoDB:

   sudo apt-get install -y mongodb-org
   

This solution is from MongoDB Forum, but I also added a few notes to keep in mind.

I had the same issue. I downloaded the lighttpd .deb package and ran dpkg which gave some more insight:

libssl1.1:armhf (1.1.1a-2~20190131152537.8+stretch) breaks lighttpd (<< 1.4.49-2) and is installed.

So it looks like the libssl 1.1.1a package from deb.sury.org is too new for the lighttpd 1.4.45 that comes from debian. I removed that package source and downgraded libssl after which I could install lighttpd. Alternatively you could try to get lighttpd 1.4.49 or later.

1. Go to http://archive.ubuntu.com/ubuntu/pool/main/o/openssl
2. find the exact version of libssl for example libssl1.1.1
3. wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1-1ubuntu2.1\~18.04.20_amd64.deb
4. Then install
5. sudo dpkg -i libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb