This seems to work fine for me. Where did you try to mount it?
If you completed the installation, could you please attach
/var/log/installer/syslog and /var/log/installer/partman?
** Changed in: partman-basicfilesystems (Ubuntu)
Status: New => Incomplete
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installer fails to mount new vfat partitions
https://bugs.launchpad.net/bugs/318671
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