On 2012-12-12, Tiki source code management moved to the new platform offered by SourceForge.net. This is a good long term move by SourceForge.net. However, the URLs for SVN have changed, and thus there is an extra step to get back to the usual ease of updating via SVN, if your original checkout was made before that date.
How to know if I have a checkout from the pre-2013 repository?
From a shell prompt, run 'svn info'.
If the URL includes 'tikiwiki.svn.sourceforge.net', you need to 'relocate' before updating your tiki.
URL: https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/branches/9.x
If the URL includes 'svn.code.sf.net', then you are using the current repository and you may use the update commands.
URL: https://svn.code.sf.net/p/tikiwiki/code/branches/9.x
If you are not using the current repository and attempt to use an update command, you will receive one of the following messages:
# svn up -r 44179 svn: Could not open the requested SVN filesystem #
# svn up svn: Repository moved permanently to 'https://svn.code.sf.net/p/tikiwiki/code/branches/proposals/6.x'; please relocate
Example commands to relocate to the new repository
Pick the command according to your version.
svn switch --relocate https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/trunk https://svn.code.sf.net/p/tikiwiki/code/trunk .
svn switch --relocate https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/branches/10.x https://svn.code.sf.net/p/tikiwiki/code/branches/10.x .
svn switch --relocate https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/branches/9.x https://svn.code.sf.net/p/tikiwiki/code/branches/9.x .
svn switch --relocate https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/branches/6.x https://svn.code.sf.net/p/tikiwiki/code/branches/6.x .
From an old 6.x proposals to the new 6.x
First change from the old to new SourceForge repo
svn switch --relocate https://tikiwiki.svn.sourceforge.net/svnroot/tikiwiki/branches/proposals/6.x https://svn.code.sf.net/p/tikiwiki/code/branches/proposals/6.x .
Then, move from proposals/6.x to 6.x
svn switch https://svn.code.sf.net/p/tikiwiki/code/branches/6.x .
Once you have relocated, you can use the regular Update commands.
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