keybase login on linux not working

Can't login though the CLI. Running the latest client.

```
Username: ***
Logged in: no

Device:
name: ***
ID: ***
status: active

Session: no session
is valid: no
keys: unlocked

Key status:
stream: not cached
secret: stored
dev sig: cached
dev enc: cached
paper sig: not cached
paper enc: not cached
prompt: show
tsec: not cached
```

When using the "keybase login" the prompt just returns without output:
```
$ keybase login
$ keybase device add
Starting `device add`...

(Please note that you should run `device add` on a computer that is
already registered with Keybase)
ⶠERROR Login required
$
```

my log id: 6a9c11d7d7ee8b031905021c

Start by reproducing the reported Linux behavior with the `keybase login` and `keybase device add` commands, using log ID 6a9c11d7d7ee8b031905021c for investigation. Trace the login failure until its cause is identified, then verify that the CLI can complete login and establish a valid session.

Written by the indexing model from the issue text.