It looks like you're having hardware issues:
[ 274.192655] ata1.00: exception Emask 0x0 SAct 0x200000 SErr 0x0 action 0x0
[ 274.192659] ata1.00: irq_stat 0x40000008
[ 274.192662] ata1.00: failed command: READ FPDMA QUEUED
[ 274.192666] ata1.00: cmd 60/20:a8:40:02:18/00:00:00:00:00/40 tag 21 ncq
16384 in
res 51/40:20:40:02:18/00:00:00:00:00/40 Emask 0x409 (media error) <F>
[ 274.192668] ata1.00: status: { DRDY ERR }
[ 274.192670] ata1.00: error: { UNC }
[ 274.351595] ata1.00: configured for UDMA/133
[ 274.351612] sd 0:0:0:0: [sda] FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 274.351616] sd 0:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor]
[ 274.351619] sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error - auto
reallocate failed
[ 274.351621] sd 0:0:0:0: [sda] CDB:
[ 274.351622] Read(10): 28 00 00 18 02 40 00 00 20 00
[ 274.351631] blk_update_request: I/O error, dev sda, sector 1573440
[ 274.351652] ata1: EH complete
[ 323.587733] ata1.00: exception Emask 0x0 SAct 0x800 SErr 0x0 action 0x0
[ 323.587745] ata1.00: irq_stat 0x40000008
[ 323.587755] ata1.00: failed command: READ FPDMA QUEUED
[ 323.587772] ata1.00: cmd 60/08:58:48:18:c1/00:00:02:00:00/40 tag 11 ncq 4096
in
res 51/40:08:48:18:c1/00:00:02:00:00/40 Emask 0x409 (media error) <F>
[ 323.587780] ata1.00: status: { DRDY ERR }
[ 323.587785] ata1.00: error: { UNC }
[ 323.698334] ata1.00: configured for UDMA/133
[ 323.698358] sd 0:0:0:0: [sda] FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 323.698364] sd 0:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor]
[ 323.698369] sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error - auto
reallocate failed
[ 323.698373] sd 0:0:0:0: [sda] CDB:
[ 323.698376] Read(10): 28 00 02 c1 18 48 00 00 08 00
[ 323.698393] blk_update_request: I/O error, dev sda, sector 46209096
[ 323.698419] ata1: EH complete
[ 323.698455] EXT4-fs warning (device sda1): __ext4_read_dirblock:1353: error
-5 reading directory block (ino 1443295, block 5)
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https://bugs.launchpad.net/bugs/1495507
Title:
package mount 2.25.2-4ubuntu2 failed to install/upgrade: unable to
stat `./usr/share/man/man8/findmnt.8.gz' (which I was about to
install): Input/output error
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