[Bug 1872896] [NEW] terminfo file xterm-256color has entries that make vi unusable when sshing in from last lts (18.04)

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This happens on a 20.04 LTS (Focal Fossa) beta system, specifically, the
xubuntu-20.04-beta-desktop-amd64.iso as downloaded on Apr 14.

When sshing into the 20.04 system, from the previous LTS (18.04),
entering/exiting insert mode in vi emits what looks like CSI>4;m  resp.
CSI>4;2m. Both sequences aren't recognized by the 18.04 terminal,
resulting in garbled output and vi being unusable.

** Affects: ncurses (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bot-comment
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terminfo file xterm-256color has entries that make vi unusable when sshing in from last lts (18.04)
https://bugs.launchpad.net/bugs/1872896
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