Recommended to be installed inside an offline VM (vault).  When you want to keepassxc as replacement for Google Authenticator (actually TTOP, Time based One Time Password) Two Factor Authentication (2FA)) then a Debian based VM is more suitable than a Whonix-Workstation ™ based VM. 
yubikey-personalization yubikey-personalization-gui are YubiKey related. Users not using YubiKey can skip installation of these packages and install
Update the package lists.
sudo apt-get update
Upgrade the system.
sudo apt-get dist-upgrade
keepassxc yubikey-personalization yubikey-personalization-gui package.
sudo apt-get install keepassxc yubikey-personalization yubikey-personalization-gui
The procedure is complete.
Optional. If you like to autostart keepassxc.
mkdir -p ~/.config/autostart/
Open ~/.config/autostart/keepassxc.desktop in an editor as a regular, non-root user.
Paste the following content.
[Desktop Entry] Type=Application Name=keepassxc Exec=keepassxc
The process is now complete.
First run question: either answer is ok.
Create a new database.
Default file name
Passwords.kdbx is ok.
If you are using Full Disk Encryption you might want to use a very easy password. Up to you.
Left click one time on
Then go to menu → entries → Add new entry → any name name as
test → ok
right click on test → time based on time password → set up TOTP → Default → paste 2FA code → ok
right click on test again → time based on time password → show TOTP
2FA TTOP code changes every 30 seconds. So clock needs to be reasonable correct.
Troubleshoting only. If code does not match.
Set timezone to UTC for simplicity.
sudo cp /usr/share/zoneinfo/Etc/UTC /etc/localtime
Go to https://www.timeanddate.com/worldclock/timezone/utc or any other similar source to find out the time in UTC.
Fix the click. Change the date and time accordingly!
sudo date -s "26 SEPT 2018 11:54:25"
Check if the clock is correct now.
- In Qubes, apt-get package installation could be done in TemplateVM.
- In Qubes, download and verification could be done in a temporary TemplateBased AppVM, ideally Qubes/DisposableVM. Then move to offline vault VM.
- In Non-Qubes-Whonix ™: install first, then disconnect internet and never re-enable internet access. TODO document
- Because accurate time required for TTOP and due to Boot Clock Randomization and sdwdate anonymizing time.
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