msys2 failed retrieving file ‘mingw64.db
msys2 failed retrieving file ‘mingw32.db
无效或已损坏的数据库 (PGP 签名)

解决方法:
pacman -U http://repo.msys2.org/msys/x86_64/msys2-keyring-1~20210213-1-any.pkg.tar.zst

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$ pacman -U http://repo.msys2.org/msys/x86_64/msys2-keyring-1~20210213-1-any.pkg.tar.zst
msys2-keyring-1~20210213-1-any 42.8 KiB 28.9 KiB/s 00:01 [#################################################] 100%
msys2-keyring-1~20210213-1-any.sig 438.0 B 0.00 B/s 00:00 [#################################################] 100%
loading packages...
warning: msys2-keyring-1~20210213-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...

Packages (1) msys2-keyring-1~20210213-1

Total Installed Size: 0.05 MiB
Net Upgrade Size: 0.00 MiB

:: Proceed with installation? [Y/n] y
(1/1) checking keys in keyring [#################################################] 100%
(1/1) checking package integrity [#################################################] 100%
(1/1) loading package files [#################################################] 100%
(1/1) checking for file conflicts [#################################################] 100%
(1/1) checking available disk space [#################################################] 100%
:: Processing package changes...
(1/1) reinstalling msys2-keyring [#################################################] 100%
==> Appending keys from msys2.gpg...
==> Locally signing trusted keys in keyring...
-> Locally signing key 123D4D51A1793859C2BE916BBBE514E53E0D0813...
-> Locally signing key B91BCF3303284BF90CC043CA9F418C233E652008...
-> Locally signing key 6E8FEAFF9644F54EED90EEA0790AE56A1D3CFDDC...
-> Locally signing key 69985C5EB351011C78DF7F6D755B8182ACD22879...
-> Locally signing key 9DD0D4217D75A33B896159E6DA7EF2ABAEEA755C...
-> Locally signing key D55E7A6D7CE9BA1587C0ACACF40D263ECA25678A...
==> Importing owner trust values...
==> Disabling revoked keys in keyring...
-> Disabling key B19514FB53EB3668471B296E794DCF97F93FC717...
==> Updating trust database...
gpg: next trustdb check due at 2022-01-23