Problem

While installing M2Eclipse to RTC 3.0.1.2. It shows below error message:

Cannot complete the install because one or more required items could not be found.
Software being installed: Maven Integration for Eclipse (Required) 0.12.1.20110112-1712 (org.maven.ide.eclipse.feature.feature.group 0.12.1.20110112-1712)
Missing requirement: Maven POM XML Editor 0.12.1.20110112-1712 (org.maven.ide.eclipse.editor.xml 0.12.1.20110112-1712) requires 'bundle org.eclipse.wst.xml.ui 0.0.0' but it could not be found
Cannot satisfy dependency:
From: Maven Integration for Eclipse (Required) 0.12.1.20110112-1712 (org.maven.ide.eclipse.feature.feature.group 0.12.1.20110112-1712)
To: org.maven.ide.eclipse.editor.xml [0.12.1.20110112-1712]

Solution

Enable the site URL: http://download.eclipse.org/releases/galileo in available sites.