Please login to console/SSH and run follow command:

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sudo -u asterisk gpg --refresh-keys --keyserver pool.sks-keyservers.net
sudo -u asterisk gpg --refresh-keys --keyserver hkp://keyserver.ubuntu.com:80
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fwconsole ma upgrade framework --tag 15.0.16.38

Once done, please update your FreePBX modules via web interface again.

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fwconsole setting MODULE_REPO https://mirror.freepbx.org
sudo chown -R asterisk:asterisk /home/asterisk/