The issue is to upgrade a Ubuntu system mounted with an encrypted home (on a seperated partition) which then cannot be decrypted/mounted with the exact same passphrase on a new fresh installed Ubuntu. This question has already been answered but "solved" (?) in a "non-deterministic" way in 602360/345970. I cannot afford keeping reinstalling Ubuntu again and again…
I currently have a Ubuntu 12.04 that I cannot upgrade (via
do-release-upgrade) due to package errors. Hence, I decided to make a fresh install of latest LTS Ubuntu 14.04. The system
/ directory (~50GB) is mounted on
sda6 and yet the encrypted home
/home is on
sda7 (~145GB). I formatted and installed the new Ubuntu on
sda6 and specified
sda7 to be considered as a mount-point for
After the install asked for a login/password (which I entered as the exact same as previous installs), I tried to log in. However, there appears that Ubuntu cannot decrypt/mount my data and shows the following
Signature not found in user keyring
Perhaps try the interactive 'ecryptfs-mount-private'
Morevoer, when I try
ecryptfs-mount-private, it asks for the login passphrase which I correctly entered for a dozen times but an error appears claiming that the password is incorrect. I rolled back to Ubuntu 12.04 with a partition backup and checked again that the password was indeed correct.
Hereafter, I discuss related issues that are not relevant to this one or left unanswered:
ecryptfs-mount-privateis not an appropriate solution. Even if, my data is correctly decrypted, it requires me to allocate twice + 3/5 of the current home directory space disk to first decrypt and copy and then re-encrypt.
- 129906/345970: Issue not answered but possibly the same (up to operating system version)
- 182078/345970: Not related to the question of re-installing an operating system.
- 286828/345970: Same issue but remained unaswered.
- 341302/345970: My login passphrase is the same as the UNIX user password. Different issue.
- 476037/345970: I'm not using LVM. In any case, that question was left unanswered.
- 485625/345970: I'm not using different user login names.
- 584656/345970: Same issue. No appropriate answer.
- 602360/345970: As said earlier, "solved" in a random/non-deterministic way, by re-installing again and again Ubuntu until reaching a match.