Try one of the following to sync your system time with the network time.
1. Check whether your system date and time are correct. If not, set the correct date and time.
2. You can also try System-> Administration-> Time and Date.
i) Unlock.
ii) Select Keep synchronized with Internet servers.
iii) If you are asked to install NTP support, click Install NTP support.
iv) Click Select Servers, and check required servers, or add a new one by typing URL of the server in the textbox clicking the Add button.
3. Please refer to the post Removing SSL Certificate Error In Ubuntu.
1. Check whether your system date and time are correct. If not, set the correct date and time.
2. You can also try System-> Administration-> Time and Date.
i) Unlock.
ii) Select Keep synchronized with Internet servers.
iii) If you are asked to install NTP support, click Install NTP support.
iv) Click Select Servers, and check required servers, or add a new one by typing URL of the server in the textbox clicking the Add button.
3. Please refer to the post Removing SSL Certificate Error In Ubuntu.
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