Seems like I need your help.
Can't go much more further...
Reading package lists... Done
W: There is no public key available for the following key IDs:
7638D0442B90D010
W: There is no public key available for the following key IDs:
9D6D8F6BC857C906
W: There is no public key available for the following key IDs:
7638D0442B90D010
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package debian-keyring is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'debian-keyring' has no installation candidate
# lsb_release -d
Description: Debian GNU/Linux 7.7 (wheezy)
any help?
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Best regards,
Roman.