The free KeePass plugin 'KP Sync for Google Drive' allows you to sync KeePass database files via Google Drive. KeePass, an open source password manager that you can use for free, has advanced features such as password generation and two-factor authentication, but it does not support database synchronization via Google Drive by default. It will also help you how to install Wine if you don’t have it yet on your computer.09:00:00 Free & KeePass Password Sync Plugin 'KP Sync for Google Drive' Review via Google Drive

It should show you how to install a Windows application on Linux Ubuntu using Wine. To have an idea on how to install KeePass on Ubuntu, please visit Spotify Fails on Linux. If you want to use plug-ins, try installing KeePass using Wine. Since your application uses a plug-in then you are probably using KeePass on your Linux Ubuntu because KeePassX doesn’t support plug-ins. Microsoft Windows 8 and later not supported. For Microsoft Windows, it requires Windows 2000, Windows XP, Windows Vista, and Windows 7. For Mac OS X, you should be running Mac OS X 10.4 Tiger until 10.9 Mavericks. You can also download it from SourceForge, KeePassX 0.4.3. To make sure you are using the latest version, download and install KeePassX 0.4.3.

It was originally named as KeePass/L because it is designed for Linux but when it became cross-platform, that’s the only time they decided to change the name since it is no longer appropriate. It is the cross-platform version of KeePass.

Since KeePass is designed only for Microsoft Windows and you are using Linux Ubuntu, you should use KeePassX. KeePass not compatible with plug-ins on Ubuntu

Keepass install plugin