I'd suggest checking your hardware (esp. SMART status of ATA drives, cables etc)
I see in your logs the following :- [ 6124.754413] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x50000 action 0x6 frozen [ 6124.754428] ata1: SError: { PHYRdyChg CommWake } [ 6124.754437] ata1.00: failed command: WRITE DMA [ 6124.754455] ata1.00: cmd ca/00:08:18:e0:64/00:00:00:00:00/e0 tag 18 dma 4096 out res 40/00:00:00:01:80/00:00:00:00:00/00 Emask 0x4 (timeout) [ 6124.754462] ata1.00: status: { DRDY } [ 6124.754472] ata1: hard resetting link [ 6125.068646] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) [ 6125.093229] ata1.00: configured for UDMA/133 [ 6125.103327] ahci 0000:00:17.0: port does not support device sleep [ 6125.103407] ata1: EH complete [ 6125.103774] ata1.00: Enabling discard_zeroes_data NOTE: SMART doesn't detect everything, but it's where I'd start, beyond validating your backups in case this is warning of a failing component/device. This may not be your only issue though. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1851451 Title: Performance is not good system freeze a lot of time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1851451/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs