Ttgjyuk

When I reboot I get an error

pci 0000:00:01.0: ASPM: Could not configure common clock
tpm_tis 00:01: A TPM error (7) occurred attempting to read a pcr value

and when run dmesg|grep TPM I get

[ 4.788710] tpm_tis 00:01: 1.2 TPM (device-id 0xB, rev-id 16)
[ 5.028712] tpm_tis 00:01: TPM is disabled/deactivated (0x7)
[ 5.128725] tpm_tis 00:01: A TPM error (7) occurred attempting to read a pcr value
[ 5.128797] ima: No TPM chip found, activating TPM-bypass

Is this a cause for concern and can I do something about it?

TPM

TPM stands Trusted Platform Module and you can read more about it on Wikipedia (TPM on Wiki). The chip when present on the motherboard is used for securely producing cryptographic keys and securing the hardware components. Several laptop motherboards (and many desktop boards) have such TPM chips.
The message you receive means: Either the chip is available but not recognized or it is absent. The message itself is harmless.

For your system, from the specs I see that there is a TPM chip (ver 1.2) onboard.

You can check in your BIOS under security or trusted computing section for TPM and deactivate it. Most probably this will stop the errors.

ASPM

ASPM stands for Active State Power Management whose purpose is to save power in order to extend battery life on portable devices like laptops. It instructs PCIe components to go to low power mode to save power. The parameters controlling ASPM are controllable (which by default should be on ON state).

To set the parameter for ASPM you can

• First understand how to try entering kernel boot parameter here on Ubuntu Wiki.


• Next you can try temporarily adding the boot parameter to resolve your issue. You will need try out several parameters and get the one which works for you.

These are the kernel parameters which you can try :

Disable ASPM:

pcie_aspm=off

Use default firmware configuration:

pcie_aspm=default

Disables ASPM and clock power management (bad for battery life):

pcie_aspm=performance

Highest power saving mode, enable ASPM and clock power management:

pcie_aspm=powersave

Force ASPM on:

pcie_aspm=force

Force ASPM on while trying to maximize saving power:

pcie_aspm=force pcie_aspm.policy=powersave 

Once you got it working make the change permanent according to the link attached (for kernel boot parameter).

coincidence, I account this problem. I enable the 'security boot' in BOIS. After restarted, the problem be solved.