i can proceede with following steps:
--------------------
create the file /etc/update-manager/release-upgrades.d/unauth.cfg as root and
add the following.
[Distro]
AllowUnauthenticated=yes
After upgrade, remove this file.
--------------------
but, still interesting why package libgbm1 have authenticating error.
here is policy:
-------------------
$ apt-cache policy libgbm1
libgbm1:
Installed: 10.1.3-0ubuntu0.1
Candidate: 10.1.3-0ubuntu0.1
Version table:
*** 10.1.3-0ubuntu0.1 0
500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
100 /var/lib/dpkg/status
10.1.0-4ubuntu5 0
500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
-------------------
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https://bugs.launchpad.net/bugs/1385271
Title:
Error authenticating some packages
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