有人知道如何修复这个问题吗？我升级了一个带有 LVM 分区的系统，/, /var, /usr, /home但似乎 initrd 无法弄清楚 LVM 方案。我在发射台关于这个问题，但是应用当 root=UUID= 时激活 VG该页面上的补丁无法修复该问题。如果我vgchange -a y从(initramfs)提示符运行，我可以挂载分区，但目前还不确定还能做什么。
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... lvmetad is not active yet, using direct activation during sysinit
done.
Begin: Running /scripts/local-premount ... done.
Begin: Will now check root file system ... fsck from util-linux 2.27.1
[/sbin/fsck.ext4 (1) -- /dev/mapper/vg_new-slash] fsck.ext4 -a -C0 /dev/mapper/vg_new-slash
/dev/mapper/vg_new-slash: clean, 20787/262144 files, 447481/1048576 blocks
done.
[ 2.154404] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null)
done.
Begin: Mounting /usr file system ... [ 2.318500] tsc: Refined TSC clocksource calibration: 3399.996 MHz
[ 2.319741] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x31024b3bec5, max_idle_ns: 440795366697 ns
Begin: Waiting for /usr file system ... Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... [ 26.329688] random: nonblocking pool is initialized
done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
Begin: Running /scripts/local-block ... done.
done.
Gave up waiting for /usr device. Common problems:
- Boot args (cat /proc/cmdline)
- Check rootdelay= (did the system wait long enough?)
- Missing modules (cat /proc/modules; ls /dev)
ALERT! UUID="78933db3-c0e9-466d-8855-4c5b0806244f" does not exist. Dropping to a shell!
BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs)
更新：
尝试了几种方法，包括各种 SF 帖子，但最后还是不得不vgchange -a y手动发出，然后退出 initramfs 提示符，这似乎已经完成了系统启动。它正在运行，但仍然有问题，因为每次重启时都必须执行此操作。
...
(initramfs) vgchange -a y
/run/lvm/lvmetad.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
6 logical volume(s) in volume group "vg_new" now active
(initramfs) ls /dev/vg_new/
slash swap usr home var mysql.bak
(initramfs) exit
Begin: Will now check /usr file system ... fsck from util-linux 2.27.1
[/sbin/fsck.ext4 (1) -- /dev/mapper/vg_new-usr] fsck.ext4 -a -C0 /dev/mapper/vg_new-usr
/dev/mapper/vg_new-usr: clean, 100849/655360 files, 532430/2621440 blocks
done.
[ 95.723025] EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts: errors=remount-ro
done.
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... done.
[ 95.820637] systemd[1]: RTC configured in localtime, applying delta of -360 minutes to system time.
[ 95.842471] systemd[1]: systemd 229 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN)
[ 95.845583] systemd[1]: Detected virtualization qemu.
[ 95.846601] systemd[1]: Detected architecture x86-64.
Welcome to Ubuntu 16.04.5 LTS!
[ 95.851545] systemd[1]: Set hostname to <myhost>.
[ 95.946468] systemd[1]: usr.mount: Unit is bound to inactive unit dev-disk-by\x2duuid-78933db3\x2dc0e9\x2d466d\x2d8855\x2d4c5b0806244f.device. Stopping, too.
[ 95.967000] systemd[1]: Reached target Encrypted Volumes.
[ OK ] Reached target Encrypted Volumes.
[ 95.969414] systemd[1]: Listening on LVM2 poll daemon socket.
[ OK ] Listening on LVM2 poll daemon socket.
[ 95.971863] systemd[1]: Created slice User and Session Slice.
[ OK ] Created slice User and Session Slice.
[ 95.974105] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
[ OK ] Listening on /dev/initctl Compatibility Named Pipe.
...