pub 2048R/886DDD89 2009-09-04 [expires: 2014-09-03] Key fingerprint = A3C4 F0F9 79CA A22C DBA8 F512 EE8C BC9E 886D DD89 uid deb.torproject.org archive signing key sub 2048R/219EC810 2009-09-04 [expires: 2014-08-29] Above text is from https://www.torproject.org/docs/signing-keys.html.en
Today is 30 august, so subkey expired and master key is going to expire soon. Please generate new keys for Debian and Ubuntu users, of course in secure manner.