Error: Cannot find module 'moment-timezone'

Hello Ghost experts!

I hope someone can point me in the right direction and I appreciate everybody’s time.

I’ve recently upgraded my ghost instance from 4.10 to 4.12.1 and now it seems as if the ghost main process fails to start due to:

Aug 18 15:30:34 ghost node[3512]: Error: Cannot find module 'moment-timezone'

I made sure this module was installed with:
npm install moment-timezone

Although I was a bit surprised it was missing in the first place, but no worries.
That didn’t help unfortunately, so perhaps someone came across a similar issue and knows how to handle it?

My OS is:
Debug Information:
OS: Ubuntu, v16.04.7 LTS
Node Version: v14.17.5
Ghost Version: 4.12.1
Ghost-CLI Version: 1.17.3
Environment: production
Command: ‘ghost start’

Here’s the output from journalctl -u ghost_stig-dlugosz-eu -n 50:

Aug 18 15:30:33 ghost systemd[1]: ghost_stig-dlugosz-eu.service: Service hold-off time over, scheduling restart.
Aug 18 15:30:33 ghost systemd[1]: Stopped Ghost systemd service for blog: stig-dlugosz-eu.
Aug 18 15:30:33 ghost systemd[1]: Started Ghost systemd service for blog: stig-dlugosz-eu.
Aug 18 15:30:34 ghost node[3512]: - Inspecting operating system
Aug 18 15:30:34 ghost node[3512]: internal/modules/cjs/loader.js:892
Aug 18 15:30:34 ghost node[3512]:   throw err;
Aug 18 15:30:34 ghost node[3512]:   ^
Aug 18 15:30:34 ghost node[3512]: Error: Cannot find module 'moment-timezone'
Aug 18 15:30:34 ghost node[3512]: Require stack:
Aug 18 15:30:34 ghost node[3512]: - /var/www/ghost/versions/4.12.1/core/server/overrides.js
Aug 18 15:30:34 ghost node[3512]: - /var/www/ghost/versions/4.12.1/core/boot.js
Aug 18 15:30:34 ghost node[3512]: - /var/www/ghost/versions/4.12.1/ghost.js
Aug 18 15:30:34 ghost node[3512]: - /var/www/ghost/versions/4.12.1/index.js
Aug 18 15:30:34 ghost node[3512]:     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:889:15)
Aug 18 15:30:34 ghost node[3512]:     at Function.Module._load (internal/modules/cjs/loader.js:745:27)
Aug 18 15:30:34 ghost node[3512]:     at Module.require (internal/modules/cjs/loader.js:961:19)
Aug 18 15:30:34 ghost node[3512]:     at require (internal/modules/cjs/helpers.js:92:18)
Aug 18 15:30:34 ghost node[3512]:     at Object.<anonymous> (/var/www/ghost/versions/4.12.1/core/server/overrides.js:8:16)
Aug 18 15:30:34 ghost node[3512]:     at Module._compile (internal/modules/cjs/loader.js:1072:14)
Aug 18 15:30:34 ghost node[3512]:     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
Aug 18 15:30:34 ghost node[3512]:     at Module.load (internal/modules/cjs/loader.js:937:32)
Aug 18 15:30:34 ghost node[3512]:     at Function.Module._load (internal/modules/cjs/loader.js:778:12)
Aug 18 15:30:34 ghost node[3512]:     at Module.require (internal/modules/cjs/loader.js:961:19) {
Aug 18 15:30:34 ghost node[3512]:   code: 'MODULE_NOT_FOUND',
Aug 18 15:30:34 ghost node[3512]:   requireStack: [
Aug 18 15:30:34 ghost node[3512]:     '/var/www/ghost/versions/4.12.1/core/server/overrides.js',
Aug 18 15:30:34 ghost node[3512]:     '/var/www/ghost/versions/4.12.1/core/boot.js',
Aug 18 15:30:34 ghost node[3512]:     '/var/www/ghost/versions/4.12.1/ghost.js',
Aug 18 15:30:34 ghost node[3512]:     '/var/www/ghost/versions/4.12.1/index.js'
Aug 18 15:30:34 ghost node[3512]:   ]
Aug 18 15:30:34 ghost node[3512]: }
Aug 18 15:30:34 ghost systemd[1]: ghost_stig-dlugosz-eu.service: Service hold-off time over, scheduling restart.
Aug 18 15:30:34 ghost systemd[1]: Stopped Ghost systemd service for blog: stig-dlugosz-eu.
Aug 18 15:30:34 ghost systemd[1]: ghost_stig-dlugosz-eu.service: Start request repeated too quickly.
Aug 18 15:30:34 ghost systemd[1]: Failed to start Ghost systemd service for blog: stig-dlugosz-eu.
Aug 18 15:30:34 ghost systemd[1]: ghost_stig-dlugosz-eu.service: Unit entered failed state.
Aug 18 15:30:34 ghost systemd[1]: ghost_stig-dlugosz-eu.service: Failed with result 'start-limit-hit'.

Let me know if you need me to provide anything else that might help resolving this.
Again, thank you in advance for your assistance!

Best,
Pawel