Use >= 2.6 to have correct version number

debian/changelog

@@ -4,7 +4,7 @@ lubuntu-artwork (0.12) UNRELEASED; urgency=low
    - New text theme, based on kubuntu one.
   * debian/control
    - New lubuntu-text binary.
-   - Depends on elementary-icon-theme >= 2.6.0 to use the new name of the
+   - Depends on elementary-icon-theme >= 2.6 to use the new name of the
      theme.
   * debian/plymouth-theme-lubuntu-text.*
    - Install and configure the new text theme.

debian/control

@@ -35,7 +35,7 @@ Description: plymouth text theme for Lubuntu
 
 Package: lubuntu-icon-theme
 Architecture: all
-Depends: ${misc:Depends}, elementary-icon-theme (>= 2.6.0)
+Depends: ${misc:Depends}, elementary-icon-theme (>= 2.6)
 Description: icon theme for Lubuntu
  This package contain a specific Lubuntu icon theme. It provides specific icons
  for main menu and distributor icons.