I had a similar problem when the public key spaned multiple lines
(however, using it with ssh worked).
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https://bugs.launchpad.net/bugs/372608
Title:
import failure: Invalid file format
For me it seems like this bug is related to #811441. After removing
/var/run/dbus/pid and restarting, the login screen appeared immediately.
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https://bugs.launchpad.net/bugs/856810
Title: