The actual error is
In toplevel form:
notmuch.el:62:1:Error: Symbol's value as variable is void:
notmuch-common-keymap
ERROR: install script from elpa-notmuch package failed
so reassigned to notmuch.
** Package changed: emacs25 (Ubuntu) => notmuch (Ubuntu)
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1693347
Title:
package emacs25 25.1+1-3ubuntu4 failed to install/upgrade: subprocess
installe