Indeed, it's switched off in the lpia config:
$ grep EXT4 debian/config/lpia/*
debian/config/lpia/config:# CONFIG_EXT4_FS is not set
** Changed in: linux (Ubuntu)
Sourcepackagename: linux-meta => linux
Importance: Undecided => Medium
Status: New => Triaged
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Cannot mount ext4 on linux-image-lpia
https://bugs.launchpad.net/bugs/331848
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