我已经阅读了许多与 ExFAT 相关的问题，对于 12.04，他们建议：
sudo apt-add-repository ppa:relan/exfat
sudo apt-get update
sudo apt-get install fuse-exfat exfat-utils
然而我在第一步就遇到了问题：
sudo apt-add-repository ppa:relan/exfat
You are about to add the following PPA to your system:
tag:launchpad.net:2008:redacted
More info: https://launchpad.net/~relan/+archive/ubuntu/exfat
Press [ENTER] to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmpwpgBPE/secring.gpg' created
gpg: keyring `/tmp/tmpwpgBPE/pubring.gpg' created
gpg: "tag:launchpad.net:2008:redacted" not a key ID: skipping
recv failed
我假设 add-apt-repository 和 apt-add-repository 是等效的，当然它们会导致相同的错误消息。
当我这样做时：
sudo apt-get update
... SNIP ...
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4DF9B28CA252A784
尽管：
apt-cache search exfat
fuse-exfat - This driver is the first free exFAT file
exfat-utils - A set of utilities for creating, checking, dumping and labelling
然而：
sudo apt-get install fuse-exfat
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
fuse-exfat
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 26.2 kB of archives.
After this operation, 98.3 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
fuse-exfat
Install these packages without verification [y/N]?
我宁愿不经过验证就安装:) 那么我该如何解决这个问题呢？
提前谢谢了！
-- 更新 -- ppa 作者回复了我发给他的一封电子邮件：
你好，
我已经放弃了 PPA，因为感谢 Debian，这些软件包现在可以在 Universe 存储库中使用。
您应该启用反向移植： https://help.ubuntu.com/community/UbuntuBackports
然后安装 exfat-fuse 包： http://packages.ubuntu.com/precise-backports/exfat-fuse
答案1
-- 更新 -- ppa 作者回复了我发给他的一封电子邮件：
你好，
我已经放弃了 PPA，因为感谢 Debian，这些软件包现在可以在 Universe 存储库中使用。
您应该启用反向移植：https://help.ubuntu.com/community/UbuntuBackports
然后安装 exfat-fuse 包：http://packages.ubuntu.com/precise-backports/exfat-fuse