[TriLUG] OS change corrupted my LVM

[vikram sai balaji ulaganathan via TriLUG]

Hi All,
I have been using Gentoo for quite a while, but due to my work change, i
have to move to a debian based approach. So i tried to install Xubuntu but
it failed multiple times as it was not able to work with btrfs (which i was
not aware). The below was the fdisk info before install

Device         Start        End    Sectors   Size Type
/dev/sda1       2048       6143       4096     2M BIOS boot
/dev/sda2       6144     268287     262144   128M EFI System -> mount /boot
/dev/sda3   40966144  245766143  204800000  97.7G Linux filesystem (BTRFS)
-> mount /
/dev/sda4  245766144 1953523119 1707756976 814.3G Linux LVM -> mount /home
(LVM+LUKS)
/dev/sda5     268288   40966143   40697856  19.4G Linux swap

Attempt 1:
Xubuntu -> choose sda3 format to btrfs "/" and start install -> install
failed to identify efi. did not touch sda4 during installation
Attempt 2:
Xubuntu -> chroot to sda3 and install grub with sda2 as boot -> success on
grub but grub-mkconfig failed. did not touch sda4 during installation
Attempt 3:
Xubuntu -> choose sda3, format to ext4 "/" and start install -> install
success. did not touch sda4 during installation

Xubuntu is working, but when i try to use pvdisplay, pvscan and all other
lvm commands, its not working. Any help here is appreciated. I have
installed testdisk and tried to scan the disk, but its not even recognizing
the LVM

Device         Start        End    Sectors   Size Type
/dev/sda1       2048       6143       4096     2M BIOS boot
/dev/sda2       6144     268287     262144   128M EFI System -> mount /boot
/dev/sda3   40966144  245766143  204800000  97.7G Linux filesystem (BTRFS)
-> mount /
/dev/sda4  245766144 1953523119 1707756976 814.3G Linux LVM -> mount /home
(LVM+LUKS)
/dev/sda5     268288   40966143   40697856  19.4G Linux swap


 Found VG info for 0 VGs
  Getting list of all devices from system
  /dev/loop0: filter cache skipping (cached bad)
  /dev/sda: filter cache skipping (cached bad)
  /dev/loop1: filter cache skipping (cached bad)
  /dev/sda1: filter cache using (cached good)
  /dev/loop2: filter cache skipping (cached bad)
  /dev/sda2: filter cache using (cached good)
  /dev/loop3: filter cache skipping (cached bad)
  /dev/sda3: filter cache using (cached good)
  /dev/loop4: filter cache skipping (cached bad)
  /dev/sda4: filter cache using (cached good)
  /dev/loop5: filter cache skipping (cached bad)
  /dev/sda5: filter cache using (cached good)
  /dev/loop6: filter cache skipping (cached bad)
  /dev/loop7: filter cache skipping (cached bad)
  Processing PVs in VG #orphans_lvm2
  Reading orphan VG #orphans_lvm2
  report/output_format not found in config: defaulting to basic
  log/report_command_log not found in config: defaulting to 0
  Unlocking /run/lock/lvm/P_global
  _undo_flock /run/lock/lvm/P_global
  Dropping VG info
  lvmcache has no info for vgname "#orphans_lvm2" with VGID #orphans_lvm2.
  lvmcache has no info for vgname "#orphans_lvm2".
  lvmcache: Initialised VG #orphans_lvm2.

Thanks in advance for your help
Vikram