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Well - I can tell you how to fix this one particular way (its the only way I know how) but it will open up another can of worms for you.

The issue is that in Ubuntu 22.04, all the username and passwords for your system are, by default, encrypted with your username's password. That is being stored in what is called the keyring. What is happening is that the VNC server is being loaded without the keyring being unlocked and therefore can't access the stored VNC password (as its encrypted) so it auto generates a new one each time you boot up.

So, if you auto boot up with your user login, during the auto boot up, Ubuntu 22.04 doesn't automatically unlock the keyring. So to fix this, go to Utilities, Password and Keys, right click on Default Keyring, select change password. It will ask for your username password. Enter that. Then for the new password, do not enter one. Leave it blank. It will warn you that all passwords stored on your keyring will become and remain unencrypted. If you can wear that risk, accept that.

Then go back to remote desktop, ensure the password you want is set, and each time you reboot, that password will then remain the same.

Hope that all makes sense :)


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    I found an insecure solution to the problem. The typical solution proposed on the internet for this is to set a blank password for the login keyring using the "Passwords and keys" app. This, however, is highly inscure as all the passwords on the device would be stored in plaintext.

    What I decided to do instead was to create a new keyring in the "Passwords and keys" app with no password and set it as the default keyring. Then I proceeded to delete the VNC password from the login keyring. Then I rebooted the computer to ensure that the new keyring is the default one. After the reboot, I reentered the VNC password in the screen sharing settings. This would store the VNC password in the new insecure keyring. Then back to "Passwords and keys" app and set the login keyring to default again. Rebooted again and now the VNC password stayed saved and the default keyring was also back to the login keyring, ensuring all future passwords saved on the device will be encrypted.

    So in essence, I just reduced the insecurity of saving all the passwords in plaintext to storing just the VNC password in plaintext.
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