Trouble by Enigmail

[RH-24]

I use Thunderbird 31.7.0. I installed Enigmail 1.8.2.


Problems
I cannot memorize a pass phrase permanently. Therefore a password is required every time.
Warning by the following popup is displayed.
You can not connect to the gpg-agent. Instead of gpg-agent in the management of the pass phrase in this system special tool (example: gnome-keyring, seahorse-agent, such as KDE wallet manager) seems to have been used. Enigmail will not be able to control the storage time of the passphrase by these tools. Therefore, setting a passphrase of storage time at Enigmail will be ignored


I did not have a similar problem in fedora21.
I think that this is a problem peculiar to LMDE.
A similar disorder occurs in Claws Mail other than Thunderbird.
Is there the solution?

[Habitual]

Try another version of enigmail