sudo synaptic
for a graphical package manager.
Otherwise, just use sudo apt-get
if the program you want isn't there, you may need to download the source and compile it yourself
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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sudo synaptic
for a graphical package manager.
Otherwise, just use sudo apt-get
if the program you want isn't there, you may need to download the source and compile it yourself
People here saying you can just download and run the .deb just like the .exe
Aren't you forgetting the "add +x permission" step?
Not specific to Mullvad, but you can use flatpak or your distro's package manager (probably apt) to install programs, On Ubuntu, you can open the software program and search the programs to install it, that should be the first thing to do when you want to install something rather than going to the website.
my tactic if the site looks trustworthy is always:
Open the terminal and copy and paste the commands found in their install guide for Ubuntu:
# Download signing key
sudo curl -fsSLo /usr/share/keyrings/mullvad-keyring.asc https://repository.mullvad.net/deb/mullvad-keyring.asc
# Add the stable repository
echo "deb [signed-by=/usr/share/keyrings/mullvad-keyring.asc arch=$( dpkg --print-architecture )] https://repository.mullvad.net/deb/stable $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/mullvad.list
# Install
sudo apt update
sudo apt install mullvad-vpn