thunderbird邮件迁移到ubuntu20.04
邮件迁移到ubuntu20.04下的thunderbird
旧ubuntu版本的thunderbird邮件，迁移到ubuntu20.04下，按照以前的作法，直接copy ~/.thunderbird/的内容就可以了。
但在ubuntu20.04下，这样做启动thunderbird后会提示
You have launched an older version of Thunderbird
A newer version of Thunderbird may have made changes to your profile which are no longer compatible with this older version. Use this profile only with that newer version, or create a new profile for this installation of Thunderbird. Creating a new profile requires setting up your accounts, calendars and add-ons again.
这是因为ubuntu20.04默认带的Thunderbird 68，启用了隔离的profile
解决方案
使用-allow-downgrade 来启动Profile manager，按提示选择刚才copy的profile启动即可。
thunderbird -profilemanager --allow-downgrade