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Then I set the $wgEnableUploads options to true in LocalSettings.php.
 
When I try to upload a file, however, I get an exception.
 
I added this line to LocalSettings.php to print a backtrace:
 
$wgShowExceptionDetails = true;
 
And the resulting backtrace/error message:
 
[b9bfa0ee] /wiki/Special:Upload MWException from line 1873 of /var/lib/mediawiki/includes/filerepo/file/LocalFile.php: Could not acquire lock for 'File-Donald_August_19_(cropped).jpg.'
Backtrace:
#0 /var/lib/mediawiki/includes/filerepo/file/LocalFile.php(1152): LocalFile->lock()
#1 /var/lib/mediawiki/includes/upload/UploadBase.php(708): LocalFile->upload(string, string, string, integer, array, boolean, User)
#2 /var/lib/mediawiki/includes/specials/SpecialUpload.php(488): UploadBase->performUpload(string, string, boolean, User)
#3 /var/lib/mediawiki/includes/specials/SpecialUpload.php(197): SpecialUpload->processUpload()
#4 /var/lib/mediawiki/includes/specialpage/SpecialPage.php(384): SpecialUpload->execute(NULL)
#5 /var/lib/mediawiki/includes/specialpage/SpecialPageFactory.php(553): SpecialPage->run(NULL)
#6 /var/lib/mediawiki/includes/MediaWiki.php(281): SpecialPageFactory::executePath(Title, RequestContext)
#7 /var/lib/mediawiki/includes/MediaWiki.php(714): MediaWiki->performRequest()
#8 /var/lib/mediawiki/includes/MediaWiki.php(508): MediaWiki->main()
#9 /var/lib/mediawiki/index.php(41): MediaWiki->run()
#10 {main}
 
Google searches yield [https://www.mediawiki.org/wiki/Thread:Project:Support_desk/File_Upload_Error this thread] and [https://www.mediawiki.org/wiki/Thread:Project:Support_desk/Problem_With_File_Upload:_Could_not_acquire_lock_for_%22mwstore://local-backend/local-public/1/1e%22. this thread] dealing with this error message.
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