How to reproduce; using git master:
` + git -C . log --oneline -1 5c63cce Merge "ApiQueryAllRevisions: Actually use 'start' and 'end'" + git -C vendor log --oneline -1 5efd7d7 Update OOjs UI to v0.12.12 + git -C skins/Vector log --oneline -1 9f5f333 Localisation updates from https://translatewiki.net. `
After configuring the database connection select advanced options ("Ask me more questions") and hit "Continue".
Pick up the defaults ("No caching (no functionality is removed, but speed may be impacted on larger wiki sites)" among others ) and hit "Continue"
An unstyled screen appears:
Install By pressing "Continue →", you will begin the installation of MediaWiki. If you still want to make changes, press "← Back".
Hit "Continue ->"
An unstyled page is generated with an exception:
MediaWiki 1.27alpha installation Language Existing wiki Welcome to MediaWiki! Connect to database Upgrade existing installation Database settings Name Options Install Complete! Restart installation Install Setting up database... done Creating tables... [22dd363a] /~saper/ybabel/mw-config/index.php?page=Install MWException from line 123 of /usr/home/saper/public_html/ybabel/includes/objectcache/ObjectCache.php: Invalid object cache type "none" requested. It is not present in $wgObjectCaches. Backtrace: #0 /usr/home/saper/public_html/ybabel/includes/objectcache/ObjectCache.php(91): ObjectCache::newFromId(string) #1 /usr/home/saper/public_html/ybabel/includes/objectcache/ObjectCache.php(307): ObjectCache::getInstance(string) #2 /usr/home/saper/public_html/ybabel/includes/GlobalFunctions.php(3589): ObjectCache::getLocalClusterInstance() #3 /usr/home/saper/public_html/ybabel/includes/db/DatabaseMysqlBase.php(690): wfGlobalCacheKey(string, string) #4 /usr/home/saper/public_html/ybabel/includes/db/Database.php(3485): DatabaseMysqlBase->getApproximateLagStatus() #5 /usr/home/saper/public_html/ybabel/includes/installer/DatabaseInstaller.php(192): DatabaseBase->begin(string) #6 /usr/home/saper/public_html/ybabel/includes/installer/DatabaseInstaller.php(218): DatabaseInstaller->stepApplySourceFile(string, string, boolean) #7 [internal function]: DatabaseInstaller->createTables(MysqlInstaller) #8 /usr/home/saper/public_html/ybabel/includes/installer/Installer.php(1596): call_user_func(array, MysqlInstaller) #9 /usr/home/saper/public_html/ybabel/includes/installer/WebInstallerPage.php(1407): Installer->performInstallation(array, array) #10 /usr/home/saper/public_html/ybabel/includes/installer/WebInstaller.php(280): WebInstallerInstall->execute() #11 /usr/home/saper/public_html/ybabel/mw-config/index.php(77): WebInstaller->execute(array) #12 /usr/home/saper/public_html/ybabel/mw-config/index.php(36): wfInstallerMain() #13 {main}