It appears one of your hard disks is failing and causing long delays in the kernel:
[ 1137.804251] ata3: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen [ 1137.804258] ata3: irq_stat 0x00000040, connection status changed [ 1137.804264] ata3: SError: { DevExch } [ 1137.804273] ata3: hard resetting link [ 1140.032186] ata3: COMRESET failed (errno=-32) [ 1140.032197] ata3: reset failed (errno=-32), retrying in 8 secs [ 1147.868122] ata3: hard resetting link [ 1150.164114] ata3: COMRESET failed (errno=-32) [ 1150.164124] ata3: reset failed (errno=-32), retrying in 8 secs [ 1158.108161] ata3: hard resetting link [ 1160.336143] ata3: COMRESET failed (errno=-32) [ 1160.336153] ata3: reset failed (errno=-32), retrying in 33 secs [ 1194.972119] ata3: hard resetting link [ 1197.632151] ata3: COMRESET failed (errno=-32) [ 1197.632163] ata3: reset failed, giving up [ 1197.632173] ata3: EH complete Please try booting Ubuntu from USB to see if that avoids the problem: http://releases.ubuntu.com/18.04 If so then it sounds like you will need to replace a hard disk. ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete ** Tags added: performance -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1818949 Title: a lot of time consume to open ubuntu To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1818949/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs