System is not booting after recent stable update

Apologies - I forgot the second request, yesterday!

Output from fdisk:

Disk /dev/sda: 465.76 GiB, 500106780160 bytes, 976771055 sectors 
Disk model: WDC WD5000AAKS-0 
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 
Disklabel type: gpt 
Disk identifier: 07334B01-D1B2-47D2-9304-91C340E3BD32 

Device      Start       End   Sectors   Size Type 
/dev/sda1    4096    618495    614400   300M EFI System 
/dev/sda2  618496 976770988 976152493 465.5G Linux filesystem 

Disk /dev/nvme0n1: 465.76 GiB, 500107862016 bytes, 976773168 sectors 
Disk model: Samsung SSD 970 EVO Plus 500GB           
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 
Disklabel type: gpt 
Disk identifier: 83915D6E-383A-4C91-B245-8CFBB04FC485 

Device             Start       End   Sectors   Size Type 
/dev/nvme0n1p1      2048   1023999   1021952   499M Windows recovery environment 
/dev/nvme0n1p2   1024000   1226751    202752    99M EFI System 
/dev/nvme0n1p3   1226752   1259519     32768    16M Microsoft reserved 
/dev/nvme0n1p4   1259520 489017343 487757824 232.6G Microsoft basic data 
/dev/nvme0n1p5 959657984 976773134  17115151   8.2G Linux swap 
/dev/nvme0n1p6 489017344 959657983 470640640 224.4G EFI System 

Partition table entries are not in disk order. 

Disk /dev/sdb: 7.53 GiB, 8086618112 bytes, 15794176 sectors 
Disk model: Flash Drive      
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 
Disklabel type: dos 
Disk identifier: 0x00000000 

Device     Boot   Start     End Sectors  Size Id Type 
/dev/sdb1  *         64 7333691 7333628  3.5G  0 Empty 
/dev/sdb2       7333692 7341883    8192    4M ef EFI (FAT-12/16/32) 

Disk /dev/loop0: 94.25 MiB, 98832384 bytes, 193032 sectors 
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 

Disk /dev/loop1: 905.84 MiB, 949837824 bytes, 1855152 sectors 
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 

Disk /dev/loop2: 1.53 GiB, 1639215104 bytes, 3201592 sectors 
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes 

Disk /dev/loop3: 879.39 MiB, 922107904 bytes, 1800992 sectors 
Units: sectors of 1 * 512 = 512 bytes 
Sector size (logical/physical): 512 bytes / 512 bytes 
I/O size (minimum/optimal): 512 bytes / 512 bytes

Apologies - I only have a couple of hours free today - being picked up for a jazz band gig with equipment later - so I may have to come back to this over the weekend.


Mod edit:- Tidy of incorrectly formatted content. No charge.
See How to Post Command Output as Preformatted Text :eyes: