Yesterday this message appeared on my screen while booting OS after powerfailure "due to low battery backup"
You are in emergency mode, After logging in type "journalctl -xb" to view system logs, "systemctl reboot" to reboot, "systemctl default" or"exit" to boot into default mode. Press enter for maintenance (or press control-D to contnue):
Following helped me getting rid of emergency mode
fsck -y /dev/sda*
*First I used sda7 but boot was successful for only one time and again entered into emergency mode, then i used sda5 and sda7 one by one.
It worked for me but by applying command nano /etc/fstab or vi /etc/fstab, output is annoying as it says
/ file was on /dev/sda5 during installation ext4 errors=remount-ro 0 1
How to deal with errors=remount-ro ? I don't know if it might harm my system.
OS = UBUNTU 18.04
Smartmontools result:
=== START OF READ SMART DATA SECTION ===SMART overall-health self-assessment test result: PASSEDGeneral SMART Values:Offline data collection status: (0x80) Offline data collection activity was never started. Auto Offline Data Collection: Enabled.Self-test execution status: ( 121) The previous self-test completed having the read element of the test failed.Total time to complete Offline data collection: ( 120) seconds.Offline data collectioncapabilities: (0x51) SMART execute Offline immediate. No Auto Offline data collection support. Suspend Offline collection upon new command. No Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. Selective Self-test supported.SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer.Error logging capability: (0x01) Error logging supported. General Purpose Logging supported.Short self-test routine recommended polling time: ( 2) minutes.Extended self-test routinerecommended polling time: ( 105) minutes.SCT capabilities: (0x003d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported.SMART Attributes Data Structure revision number: 16Vendor Specific SMART Attributes with Thresholds:ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 100 100 050 Pre-fail Always - 0 2 Throughput_Performance 0x0027 100 100 050 Pre-fail Always - 0 3 Spin_Up_Time 0x0023 100 100 002 Pre-fail Always - 1368 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 5899 5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 8 7 Seek_Error_Rate 0x002f 100 100 050 Pre-fail Always - 0 8 Seek_Time_Performance 0x0025 100 100 050 Pre-fail Offline - 0 9 Power_On_Hours 0x0032 061 061 000 Old_age Always - 15756 10 Spin_Retry_Count 0x0033 217 100 030 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 5587183 Runtime_Bad_Block 0x0032 100 100 001 Old_age Always - 0184 End-to-End_Error 0x0033 100 100 097 Pre-fail Always - 0185 Unknown_Attribute 0x0032 100 100 001 Old_age Always - 65535187 Reported_Uncorrect 0x0032 001 001 000 Old_age Always - 24102188 Command_Timeout 0x0032 100 099 000 Old_age Always - 8189 High_Fly_Writes 0x003a 100 100 001 Old_age Always - 0190 Airflow_Temperature_Cel 0x0022 063 045 040 Old_age Always - 37 (Min/Max 30/39)191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 563192 Power-Off_Retract_Count 0x0022 100 100 000 Old_age Always - 23069024193 Load_Cycle_Count 0x0032 070 070 000 Old_age Always - 308244194 Temperature_Celsius 0x0022 063 045 040 Old_age Always - 37 (Min/Max 30/39)196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 1197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 3320199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0SMART Error Log Version: 1ATA Error Count: 25061 (device log contains only the most recent five errors) CR = Command Register [HEX] FR = Features Register [HEX] SC = Sector Count Register [HEX] SN = Sector Number Register [HEX] CL = Cylinder Low Register [HEX] CH = Cylinder High Register [HEX] DH = Device/Head Register [HEX] DC = Device Command Register [HEX] ER = Error register [HEX] ST = Status register [HEX]Powered_Up_Time is measured from power on, and printed asDDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,SS=sec, and sss=millisec. It "wraps" after 49.710 days.Error 25061 occurred at disk power-on lifetime: 15747 hours (656 days + 3 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 41 50 ae 2c 01 40 Error: UNC at LBA = 0x00012cae = 76974 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 58 00 2d 01 40 00 01:24:48.589 READ FPDMA QUEUED 60 80 50 80 2c 01 40 00 01:24:48.558 READ FPDMA QUEUED 60 80 48 00 2c 01 40 00 01:24:48.558 READ FPDMA QUEUED 60 80 40 80 2b 01 40 00 01:24:48.558 READ FPDMA QUEUED 60 80 38 00 2b 01 40 00 01:24:48.557 READ FPDMA QUEUEDError 25060 occurred at disk power-on lifetime: 15745 hours (656 days + 1 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 41 f0 ae 2c 01 40 Error: UNC at LBA = 0x00012cae = 76974 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 f8 60 9f 50 40 00 00:00:20.324 READ FPDMA QUEUED 60 01 f0 ae 2c 01 40 00 00:00:20.277 READ FPDMA QUEUED 60 80 e8 e0 9e 50 40 00 00:00:20.277 READ FPDMA QUEUED 60 80 e0 60 9e 50 40 00 00:00:20.277 READ FPDMA QUEUED 2f 00 01 10 00 00 28 00 00:00:20.276 READ LOG EXTError 25059 occurred at disk power-on lifetime: 15745 hours (656 days + 1 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 41 d8 ae 2c 01 40 Error: UNC at LBA = 0x00012cae = 76974 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 01 d8 ae 2c 01 40 00 00:00:20.185 READ FPDMA QUEUED 60 02 d0 32 2c 01 40 00 00:00:20.185 READ FPDMA QUEUED 60 02 c8 30 2c 01 40 00 00:00:20.185 READ FPDMA QUEUED 61 08 c0 38 75 03 40 00 00:00:20.184 WRITE FPDMA QUEUED 60 3d b8 71 2c 01 40 00 00:00:20.169 READ FPDMA QUEUEDError 25058 occurred at disk power-on lifetime: 15744 hours (656 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 41 18 ae 2c 01 40 Error: UNC at LBA = 0x00012cae = 76974 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 01 18 ae 2c 01 40 00 00:00:20.376 READ FPDMA QUEUED 60 80 10 c0 bf 2e 40 00 00:00:20.376 READ FPDMA QUEUED 60 80 08 40 bf 2e 40 00 00:00:20.376 READ FPDMA QUEUED 2f 00 01 10 00 00 28 00 00:00:20.370 READ LOG EXT 60 80 08 40 bf 2e 40 00 00:00:20.329 READ FPDMA QUEUEDError 25057 occurred at disk power-on lifetime: 15744 hours (656 days + 0 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 41 00 ae 2c 01 40 Error: UNC at LBA = 0x00012cae = 76974 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 01 00 ae 2c 01 40 00 00:00:20.291 READ FPDMA QUEUED 60 02 f8 32 2c 01 40 00 00:00:20.291 READ FPDMA QUEUED 60 02 f0 30 2c 01 40 00 00:00:20.291 READ FPDMA QUEUED 61 08 e8 38 75 03 40 00 00:00:20.290 WRITE FPDMA QUEUED 60 3d e0 71 2c 01 40 00 00:00:20.275 READ FPDMA QUEUEDSMART Self-test log structure revision number 1Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error# 1 Extended offline Completed: read failure 90% 15753 76974# 2 Extended offline Aborted by host 40% 31 -# 3 Short offline Completed without error 00% 30 -# 4 Extended offline Completed without error 00% 30 -# 5 Short offline Completed without error 00% 28 -SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testingSelective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk.If Selective self-test is pending on power-up, resume after 0 minute delay.