emacs: undefined symbol: json_string_length

[Paul Huygen]

Recently I upgraded to Ubuntu 21.04. Since then emacs is broken. When I try to install it or run it I get the error message: "emacs: undefined symbol: json_string_length". It occurs in thet three emacs-flavors emacs-lucid, emacs-gtk and emacs-nox.

Release: Ubuntu 21.04

Real behaviour:

paul@klipperaak:~$ /usr/bin/emacs
/usr/bin/emacs: symbol lookup error: /usr/bin/emacs: undefined symbol: json_string_length
paul@klipperaak:~$

Expected behaviour:

Open a window with emacs in it.

[Paul Huygen (paul-huygen)]

I tried to clean up and install emacs-gtk install, using the following script:

---------
#!/bin/bash
apt-get update
apt-get upgrade
apt-get dist-upgrade
dpkg --purge --force-depends emacs-common emacs-el emacs-bin-common emacsen-common emacs-gtk
apt-get install emacs-common emacs-el emacs-bin-common emacsen-common
apt-get install emacs-gtk
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The output is in the attachment. It shows that the problem occurs when emacsen-common is installed.