I encountered the same issue on my desktop, but ended up doing the partition surgery a little differently. First I resized /, /home, etc. for some extra space,

I encountered the same issue on my desktop, but ended up doing the partition surgery a little differently. First I resized /, /home, etc. for some extra space, then I moved them all forward a bit, then I resized /boot. Complicated by various layers of LVM and encryption. This took longer and in retrospect was perhaps a bit riskier, but it had the advantage of not needing to change any configuration on the actual system (since all of the partition numbers/names/uuids remained the same -- they just showed up at slightly different places with slightly different sizes). So the whole operation could be done entirely from a live/rescue environment.