Awesome GUI Password Manager.

• Install using apt:

  sudo apt install keepassxc

• Download the AppImage, GPG Key, and SHA Digest: https://keepassxc.org/download/
• Import KeePassXC's gpg signing key:

  gpg --fetch-keys https://keepassxc.org/keepassxc_master_signing_key.asc

• GPG Verify the signature file:

  gpg --verify KeePassXC-*.sig

• Verify integrity of the AppImage:

  sha256sum -c KeePassXC-*.AppImage.DIGEST

• Move the AppImage to somewhere in your $PATH:

  mv ~/Downloads/KeePassXC-*.AppImage ~/.local/bin/keepassxc

• Make the AppImage executable:

  chmod u+x ~/.local/bin/keepassxc

• Create a .desktop file:

  [Desktop Entry]
  Name=KeePassXC
  GenericName=Community Password Manager
  Exec="keepassxc" %U
  Icon=appimagekit-keepassxc
  Terminal=false
  Type=Application
  Categories=Qt;Utility;
  MimeType=application/x-keepass2;
  X-Desktop-File-Install-Version=0.22

There's a small difference in using the keepassxc-cli depending on the method used to install. Note the hyphen - usage.

• Installed using the apt instructions above:

  keepassxc-cli help

• Installed using the AppImage instructions above:

  keepassxc cli help

• https://keepassxc.org
• https://keepassxc.org/verifying-signatures/
• https://packages.debian.org/bullseye/keepassxc
• https://manpages.debian.org/testing/keepassxc/keepassxc.1.en.html
• https://manpages.debian.org/unstable/keepassxc/keepassxc-cli.1.en.html