How to upgrade remote branch in launchpad?

[Ben Lau]

Hi ,

  I have a source repository in launchpad which is still using branch
format 5 that do not support tag. I just upgraded my local branch and
tagged the repository. However, if I push the local branch to remote
branch in launchpad, it said:

bzr: ERROR: Tags not supported by BzrBranch5('[[snipped]]'); you may
be able to use bzr upgrade --dirstate-tags.

  How can I upgrade the remote branch in launchpad?

Thanks.