The discussion revolves around the “Upgrade Docker Failed” issue. geoff777 initially encountered a problem while upgrading Docker, receiving an error message related to the themes:update task. After upgrading two theme components, the Docker upgrade successfully completed, although it’s unclear if this was the actual fix geoff777.
driib asked for clarification on how to upgrade themes and components, as they also encountered the same error. geoff777 replied that they had a few theme components installed, which needed updating, but were unsure if this was the reason for the successful upgrade.
terrillmoore experienced a similar error, with the UI indicating that their themes were up to date. Falco suggested attempting a rebuild using the command ./launcher rebuild app. terrillmoore confirmed that this solution worked for them.
I’m ugrading from v2.6.0.beta4 +52
When I arrived to upgrade I found everything still upgrading from the last time … except the docker manager?
I reset all and started to upgrade Docker … this is the where it all went pear-shaped.
rake aborted!
Don't know how to build task 'themes:update' (See the list of available tasks with `rake --tasks`)
Did you mean? themes:audit
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
I tried again.
When I noticed ‘themes:update’ I upgraded two theme components.
When I returned to check on the Docker upgrade it had successfully completed.
Not sure if my upgrading the theme components was the fix.
But it had failed to upgrade twice before I did it.
@geoff777 Thank you for posting how you solved the problem! May I ask how does one upgrade themes and components? I have the same error but I only have two stock themes and no components at all. Installing a theme or theme component does not describe any specifics of theme updates, only a way to install them from git. Did you have to overwrite the stock theme with the latest version from github?
2.6.0.beta4 to 2.7.0.beta1 in my case.
P.S. My guess is that you used discourse/lib/tasks/themes.rake at b5705348b32fff406d8e7e3463def65eaf635206 · discourse/discourse · GitHub but I am not sure how to invoke it correctly to keep my install “upgradeable” (I don’t want to install any customizations).
Hi Andrew,
I have a few theme components installed. Two needed updating.
I wasn’t sure whether my updating the theme components was the reason everything started to work.
I think it’s just the old computer gremlins … no explanation why but it worked the third time and thank you .. move on before it breaks again … 
Had a similar error, and the UI claims my themes are up to date. Not sure how to proceed. Also updating 2.6 to 2.7
Can you try a rebuild?
cd /var/discourse
./launcher rebuild app
yep, I’ll try that next.
That fixed it, thanks.