This bug was fixed in the package ubuntu-mate-welcome - 16.04.0
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ubuntu-mate-welcome (16.04.0) xenial; urgency=medium
* Overhaul of the user interface.
* Context menu removed. Closes (LP: #1480718)
* Detects if repository is available. Closes (LP: #1500533)
* Fixes
** Changed in: ubuntu-mate-welcome (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1500533
Title:
Ubuntu Mate Welcome can't install any software when OS
Thanks for sharing the feedback. It's true, Ubuntu MATE Welcome cannot
install software when the computer is not connected to the Internet. It
also causes problems later when repositories are improperly being added
(and attempts to refresh the source list) due to being offline.
To address this,
In ubuntu mate welcome there in the introduction setting there is a way
to launch the software updater. Why not for new users if it fails to
find packages on install 1, check internet connection then maybe have a
dialog to launch software updates to get the package list working which
software
